Is F45 Workout Safe During Pregnancy? Expert Guidance

Quick verdict: ⚠️ Talk to your doctor first. F45 can be okay in pregnancy if you keep intensity moderate, limit sessions to 2–3 per week, and make trimester‑specific modifications, but it isn’t universally recommended for every pregnant person. The key is adapting the workout to your changing body and getting medical clearance before continuing or starting.

It’s 2 a.m., the glow of your phone screen feels too bright, and you’re frantically searching “is f45 workout safe during pregnancy.” Maybe you’ve just found out you’re expecting and you’re wondering if you need to pause your membership. Or perhaps you’ve already done a class and now you’re panicking about whether those burpees or kettlebell swings could have affected your baby. First, take a slow breath. You’re not alone—this is one of the most common questions we hear from moms-to-be who love their F45 routine. The good news? You don’t need to quit exercise entirely, but you do need to make some thoughtful adjustments.

In this article, we’ll walk you through exactly what the medical experts say about F45 during pregnancy, how to modify your workouts safely in each trimester, and what warning signs mean you should stop and call your provider. We’ll also give you a full list of gentler alternatives if you decide F45 isn’t the right fit right now. By the end, you’ll have a clear, evidence-backed plan so you can keep moving with confidence—or switch to something that feels better for your body.

What is the F45 workout?

F45 (short for “Functional 45”) is a group-fitness program that blends high-intensity interval training (HIIT) with functional training moves. Each class lasts about 45 minutes and is split into stations that focus on cardio, strength, and core work. The sessions are fast-paced, often using equipment such as kettlebells, battle ropes, sleds, and plyometric boxes. Instructors call out the next exercise, and participants rotate through the stations, aiming to keep heart rates elevated for short bursts followed by brief recovery periods.

People love F45 for its community vibe, the variety of movements, and the promise of efficient calorie burning. The program markets itself as suitable for all fitness levels, with modifications suggested on the fly. However, the high-intensity nature and the inclusion of jumps, lunges, and rapid direction changes mean the workout can be demanding on joints, balance, and cardiovascular load—factors that become especially important when you’re pregnant.

One unique aspect of F45 is its structured format. Unlike open gym sessions where you design your own workout, F45 provides a guided experience with timed intervals. This can be helpful during pregnancy because it removes the guesswork about how long to exercise, but it also means you’ll need to be proactive about requesting modifications. Most studios use a digital display to show the current exercise and time remaining, which can help you pace yourself and skip moves that feel too intense.

Another consideration is the competitive atmosphere that some F45 classes foster. While this can be motivating when you’re not pregnant, it’s important to remember that pregnancy isn’t the time to push for personal bests. The focus should shift from performance to maintaining fitness safely. Many pregnant members find it helpful to position themselves near the back of the class where they can move at their own pace without feeling pressured to keep up with others.

Is f45 workout safe during pregnancy?

Because F45 classes are typically high-intensity, they sit at the upper end of the recommended intensity spectrum. For someone who has been consistently doing F45 before pregnancy, a modified, lower-impact version may be permissible, but the consensus among obstetric experts is to get medical clearance first. The potential risk comes from sudden spikes in heart rate, impact-related joint stress, and core exercises that could increase intra-abdominal pressure.

It’s also worth noting that pregnancy affects your body in ways that might not be immediately obvious. For example, the hormone relaxin loosens your ligaments, which can increase your risk of joint injuries even if you’re doing familiar movements. Your blood volume increases by about 50%, which means your heart is working harder even at rest. And your center of gravity shifts as your belly grows, making balance more challenging. These changes don’t mean you can’t exercise, but they do mean you need to be more mindful of your body’s signals.

In short, the answer to “is f45 workout safe during pregnancy” is: it can be safe with medical approval, reduced intensity, and trimester-specific modifications. If you’re new to F45 or have pregnancy complications such as hypertension, gestational diabetes, or a history of preterm labor, most clinicians advise opting for lower-impact prenatal programs instead. The key is to work with your provider to assess your individual risk factors and create a plan that’s right for you.

Safety by trimester

First trimester (weeks 1-13)

The first trimester is the period of organ formation, so the body is particularly sensitive to any stress that could affect blood flow or oxygen delivery. ACOG advises keeping exercise intensity at a moderate level, defined as being able to talk comfortably while moving (the “talk test”). For F45, this means scaling back the explosive moves—replace box jumps with step-ups, and swap heavy kettlebell swings for lighter dumbbell exercises. Keep sessions to 30-45 minutes and aim for a heart-rate under 140 bpm.

One of the biggest challenges in the first trimester is fatigue. Many pregnant people feel exhausted, especially in the early weeks, and may not have the energy for high-intensity workouts. It’s okay to shorten your sessions or take extra rest days. Listen to your body and don’t push through exhaustion. If you’re experiencing morning sickness, you might find that working out in the afternoon or evening feels better than early morning sessions.

Another consideration is hydration. Even if you’re not visibly sweating, your body needs more fluids during pregnancy. Bring a large water bottle to class and sip throughout the session. Some pregnant members find it helpful to add electrolytes to their water to prevent dizziness or lightheadedness, especially if they’re prone to low blood pressure.

First trimester modifications: What to swap and why

If you’re used to the intensity of F45, it can be hard to know which moves to modify. Here’s a quick guide to common first-trimester swaps:

• Box jumps → Step-ups: Reduces impact on joints and lowers fall risk.
• Burpees → Squat to press: Eliminates the jump and reduces core pressure.
• Heavy kettlebell swings → Dumbbell deadlifts: Maintains strength without the momentum that can strain your back.
• Battle ropes → Resistance band rows: Keeps your heart rate up without the jarring impact.
• Sled pushes → Walking lunges: Builds leg strength without the heavy loading.

Always let your instructor know you’re pregnant so they can help you adjust moves on the fly. Most F45 trainers are trained in modifications, but they can’t help if they don’t know your status.

Second trimester (weeks 14-27)

During the second trimester, many pregnant people feel an energy boost, but the growing uterus shifts the center of gravity, increasing fall risk. Continue to limit intensity and avoid any exercises that require rapid direction changes or heavy loading on the core. Modifications such as using resistance bands instead of weighted sled pushes, and performing standing core work rather than supine abdominal crunches, are recommended. If you feel dizzy, short-of-breath, or notice any abdominal pain, stop immediately.

This trimester is often when you’ll start to feel your baby move, which can be a helpful reminder to slow down. If you’re used to pushing through discomfort, pregnancy is the time to redefine what “working hard” means. Instead of focusing on intensity, focus on consistency and maintaining your fitness level. Many pregnant members find that they need to reduce the weight they’re lifting by about 20-30% to maintain good form and avoid straining their joints.

Balance becomes a bigger concern in the second trimester. As your belly grows, your center of gravity shifts forward, making it harder to stay stable during exercises like single-leg movements or lateral shuffles. If your studio offers a balance pad or BOSU ball, you can use these to practice stability exercises safely. Alternatively, you can modify moves to keep both feet on the ground whenever possible.

Second trimester: Core and pelvic floor considerations

Your core and pelvic floor undergo significant changes during pregnancy, and it’s important to protect them during workouts. Avoid any exercises that cause coning (a doming effect in your abdomen) or increase downward pressure on your pelvic floor. Here are some core-friendly modifications for common F45 moves:

• Planks → Standing Pallof press: Engages your core without the risk of coning.
• Russian twists → Seated torso rotations: Reduces pressure on your abdominal muscles.
• Leg raises → Standing knee lifts: Strengthens your lower abs without straining your back.
• Sit-ups → Dead bugs: A safer way to work your core while lying down.

If you experience any pelvic heaviness or discomfort during or after a workout, it’s a sign that you need to further modify your exercises. Some pregnant people find it helpful to wear a maternity support belt during workouts to reduce strain on their lower back and pelvis.

Third trimester (weeks 28-40)

In the final months, the priority shifts to maintaining comfort and preventing premature labor. Low-impact circuit stations, reduced weight, and a focus on gentle cardio (e.g., stationary bike intervals) are safest. Many studios now offer “Prenatal” or “Gentle” F45-style classes that replace high-impact plyometrics with body-weight movements. Sessions should be no longer than 30 minutes, and you should stop if you experience uterine contractions, vaginal bleeding, or a sudden increase in pelvic pressure.

This trimester is all about listening to your body. What felt fine a few weeks ago might now feel uncomfortable or exhausting. It’s normal to need to reduce the intensity or duration of your workouts as your due date approaches. Many pregnant members find that they need to take more frequent breaks during class, especially if they’re experiencing shortness of breath or Braxton Hicks contractions.

Hydration and temperature control become even more important in the third trimester. Your body is working harder to regulate its temperature, and overheating can be dangerous for your baby. Wear loose, breathable clothing to class, and avoid working out in hot or humid conditions. If your studio doesn’t have good air circulation, consider moving your workout to a cooler time of day or switching to a different location.

Third trimester: Preparing for labor and delivery

Exercise in the third trimester isn’t just about staying fit—it’s also about preparing your body for labor and delivery. Focus on exercises that strengthen your legs, glutes, and pelvic floor, as these muscles play a key role in childbirth. Here are some third-trimester-friendly moves to incorporate into your F45 sessions:

• Sumo squats: Opens your hips and strengthens your inner thighs.
• Glute bridges: Strengthens your posterior chain and can help relieve lower back pain.
• Seated rows: Improves posture and strengthens your upper back, which can help counteract the forward pull of your growing belly.
• Side-lying leg lifts: Strengthens your hips and outer thighs without putting pressure on your pelvic floor.

If your studio offers prenatal-specific classes, these can be a great way to meet other expectant parents while learning labor-prep exercises. Many prenatal classes also include breathing techniques and relaxation exercises that can be helpful during delivery.

Breastfeeding

Post-delivery, moderate-intensity exercise is generally encouraged to support recovery and mood. Most providers agree that returning to an adapted F45 routine is fine once you’ve regained pre-pregnancy fitness levels and are not experiencing nipple soreness or low milk supply. Hydration and a gradual ramp-up are key.

One thing to keep in mind is that your joints may still be loose from the relaxin hormone, which can take several months to return to normal levels. This means you’ll need to be extra careful with high-impact moves and heavy lifting to avoid injury. Start with low-impact modifications and gradually increase the intensity as your body feels ready.

Breastfeeding can also affect your energy levels and hydration needs. Some new moms find that they need to adjust their workout timing to avoid engorgement or discomfort. For example, you might prefer to nurse or pump right before a workout to feel more comfortable. Others find that working out first thing in the morning, before their first feeding, works better for their schedule.

Postpartum recovery: When to return to F45

Every postpartum recovery is different, and the timeline for returning to F45 will depend on factors like your delivery experience, fitness level before pregnancy, and any complications you may have had. In general, most providers recommend waiting until your six-week postpartum checkup before resuming high-intensity exercise. If you had a C-section or experienced diastasis recti (abdominal separation), you may need to wait longer and focus on core rehabilitation first.

When you do return, start with shorter, lower-intensity sessions and gradually build up. Pay attention to how your body feels, especially your pelvic floor and core. If you notice any heaviness, leaking, or doming in your abdomen, it’s a sign that you need to scale back and focus on rebuilding strength safely. Many new moms find it helpful to work with a postpartum fitness specialist or pelvic floor physical therapist to create a safe return-to-exercise plan.

How many F45 sessions per week are safe for pregnant women?

Most obstetric guidelines suggest 150 minutes of moderate-intensity aerobic activity per week for healthy pregnancies. Translating that into F45 terms means roughly 2-3 sessions per week, each lasting 30-45 minutes, with at least one rest day between classes. If you’re new to F45, start with one 30-minute session and see how you feel before adding more. Always listen to your body—fatigue, excessive soreness, or any unusual symptoms are signals to scale back.

It’s also important to consider the cumulative stress of your workouts. Even if you feel fine during a session, high-intensity exercise can take a toll on your body over time. Pregnancy is not the time to push for fitness gains—it’s about maintaining your health and preparing your body for childbirth. If you’re used to doing F45 five or six days a week, you’ll need to reduce your frequency to avoid overtraining.

Another factor to consider is your schedule and energy levels. Pregnancy can be unpredictable, and some days you might feel great while others leave you exhausted. It’s okay to adjust your workout plan based on how you’re feeling. Some pregnant members find it helpful to schedule their F45 sessions for times of day when they have the most energy, whether that’s first thing in the morning or later in the afternoon.

Creating a balanced weekly workout plan

If you’re used to a high-frequency workout routine, it can be helpful to create a balanced weekly plan that includes a mix of F45 and lower-impact activities. Here’s an example of what a safe weekly workout schedule might look like during pregnancy:

• Monday: Modified F45 class (30-45 minutes)
• Tuesday: Prenatal yoga or walking (30-40 minutes)
• Wednesday: Rest or gentle stretching
• Thursday: Modified F45 class (30-45 minutes)
• Friday: Water aerobics or swimming (30-40 minutes)
• Saturday: Low-impact Pilates or walking (30-40 minutes)
• Sunday: Rest or gentle stretching

This schedule allows you to maintain your fitness level while giving your body time to recover between higher-intensity sessions. It also incorporates activities that support flexibility, pelvic floor strength, and relaxation—all important components of a healthy pregnancy.

Are there specific F45 class types that are safer for pregnancy?

F45 studios often label classes by theme. “Athlete” and “Hollywood” are the most intense, featuring heavy lifts and explosive cardio. “Mix” classes tend to balance cardio and strength, making them easier to modify. If your studio offers a “Prenatal” or “Gentle” version, those are the safest choices. Even within a “Mix” class, ask the instructor to skip high-impact stations and replace them with low-impact alternatives such as rowing or step-ups.

Some studios also offer “Resistance” or “Strength” classes, which focus more on weight training and less on cardio. These can be a good option during pregnancy because they allow you to control the intensity and avoid high-impact moves. However, you’ll still need to modify exercises that involve heavy lifting or put pressure on your core.

If your studio doesn’t offer prenatal-specific classes, talk to the manager about creating a modified version for you. Many studios are happy to accommodate pregnant members by providing alternative exercises or allowing you to work at your own pace. You can also ask if there’s a trainer who specializes in prenatal fitness who can help you modify moves safely.

How to communicate with your F45 instructor

Letting your instructor know you’re pregnant is the first step to ensuring a safe workout. Here are some tips for communicating effectively:

• Be upfront: Tell your instructor as soon as you arrive that you’re pregnant and would like modifications.
• Ask for alternatives: If you see a move on the board that you know isn’t safe, ask for a substitution before the round starts.
• Use the talk test: If you can’t carry on a conversation during a move, it’s too intense. Ask for a lower-impact version.
• Bring a water bottle: Hydration is key, and having water nearby makes it easier to take sips between stations.
• Know your limits: If a move doesn’t feel right, skip it entirely. Your instructor can suggest a rest station or alternative exercise.

Most F45 instructors are trained to provide modifications, but they can’t help if they don’t know you’re pregnant. Don’t be shy about speaking up—your safety and your baby’s safety come first.

What are the risks of doing F45 workouts while pregnant?

The primary concerns are:

• Elevated heart rate that exceeds recommended limits, which can reduce uterine blood flow.
• High-impact movements that increase the chance of falls or abdominal trauma.
• Excessive intra-abdominal pressure from heavy core work, potentially contributing to diastasis recti.
• Overheating in a hot studio, which can raise core temperature and affect fetal development.

Most of these risks are mitigated by moderating intensity, staying hydrated, and using proper modifications. However, if you have pregnancy-specific complications (e.g., preeclampsia, placenta previa), the risks may outweigh any benefit, and a doctor will likely advise you to avoid high-intensity classes altogether.

Another risk to consider is joint injury. The hormone relaxin loosens your ligaments during pregnancy, which can make your joints less stable. This increases your risk of sprains or strains, especially during high-impact or rapid movements. To protect your joints, focus on controlled movements and avoid any exercises that feel unstable or painful.

Finally, there’s the risk of overexertion. Pregnancy is not the time to push through fatigue or discomfort. If you feel lightheaded, dizzy, or overly fatigued during a workout, it’s a sign that you need to stop and rest. Pushing too hard can lead to dehydration, overheating, or even fainting, all of which can be dangerous for you and your baby.

Understanding the "talk test" and heart rate monitoring

One of the simplest ways to monitor your intensity during pregnancy is the “talk test.” If you can carry on a conversation while exercising, you’re likely at a moderate intensity. If you’re too breathless to talk, you’re working too hard. This method is recommended by ACOG and is a reliable way to gauge your effort without needing to track your heart rate.

If you prefer to monitor your heart rate, aim to stay below 140 bpm. This is the general guideline from ACOG and the NHS for moderate-intensity exercise during pregnancy. However, it’s important to note that heart rate can vary based on factors like fitness level, age, and individual health. Some pregnant people may need to stay below 130 bpm, while others can safely go up to 150 bpm. Talk to your provider about what’s right for you.

Wearing a heart rate monitor can help you stay within your target zone, but it’s not foolproof. Some monitors can be inaccurate, especially if they’re not properly calibrated. It’s also possible to have a normal heart rate but still feel overexerted. That’s why it’s important to use the talk test in combination with heart rate monitoring to ensure you’re exercising safely.

Can I substitute F45 with low-impact prenatal fitness classes?

Absolutely. Low-impact options such as prenatal yoga, water aerobics, and low-impact Pilates provide the cardio and strength benefits of F45 without the high-impact stressors. Many pregnant people find that these alternatives help maintain flexibility, improve circulation, and reduce joint pain—key concerns as the body changes.

One of the biggest advantages of prenatal-specific classes is that they’re designed with your changing body in mind. Instructors are trained to provide modifications that protect your core and pelvic floor, and the classes often include exercises that prepare your body for labor and delivery. For example, prenatal yoga classes typically include poses that open your hips and strengthen your pelvic floor, while water aerobics provides a low-impact cardio workout that’s gentle on your joints.

Another benefit of prenatal classes is the sense of community. Many pregnant people find it helpful to connect with others who are going through similar experiences. This can be especially valuable if you’re feeling isolated or anxious about your pregnancy. Plus, prenatal classes often include relaxation and breathing techniques that can help you manage stress and prepare for childbirth.

How to choose the right prenatal fitness class for you

With so many options available, it can be hard to know which prenatal fitness class is right for you. Here are some factors to consider:

• Your fitness level: If you’re new to exercise, look for beginner-friendly classes that focus on gentle movement. If you’re more experienced, you might prefer a class that offers a higher intensity or more challenging modifications.
• Your goals: Are you looking to maintain your fitness level, prepare for labor, or simply stay active? Different classes focus on different goals, so choose one that aligns with what you want to achieve.
• Your schedule: Consider the class times and locations that work best for you. If you have a busy schedule, you might prefer a class that offers flexible timing or online options.
• Your budget: Prenatal classes can vary in cost, so look for options that fit your budget. Some studios offer discounts for multi-class packages or memberships.
• Your comfort level: It’s important to feel comfortable in your class, so look for an instructor who is supportive and knowledgeable about prenatal fitness. You might want to try a few different classes before deciding which one feels right for you.

Safe dosage / amount / brands

Because F45 is a class rather than a supplement, “dosage” refers to session frequency, duration, and intensity. Here’s a quick guide:

If your local studio brands its equipment (e.g., “F45 ProGear”), there’s no evidence that any specific brand is safer. Focus instead on the class structure and instructor’s willingness to modify moves. What matters most is how you adapt the workout to your body’s needs. For example, if your studio uses battle ropes, you might replace them with resistance band rows to keep your heart rate up without the jarring impact.

How to modify equipment use during pregnancy

F45 classes often use a variety of equipment, and some of it may need to be modified during pregnancy. Here’s how to adapt common F45 equipment safely:

• Kettlebells: Reduce the weight and avoid swinging movements. Instead, use kettlebells for controlled lifts like goblet squats or deadlifts.
• Battle ropes: Replace with resistance band rows or seated cable rows to avoid the jarring impact.
• Plyo boxes: Use for step-ups or incline push-ups instead of jumps. This reduces impact while still engaging your legs and core.
• Sleds: Reduce the weight and focus on controlled pushes or pulls. Avoid explosive movements that could strain your core.
• Resistance bands: Use for low-impact strength exercises like rows, chest presses, and lateral walks. Bands are a great way to maintain muscle tone without heavy loading.
• TRX straps: Use for supported squats, rows, or assisted lunges. Avoid any moves that require you to lie on your back or put pressure on your abdomen.

Always let your instructor know if you’re unsure about how to modify a piece of equipment. They can help you find a safe alternative that keeps you moving without compromising your safety.

Side effects and risks

Most pregnant people who modify F45 appropriately experience no serious side effects. The most common complaints are mild muscle soreness, fatigue, and occasional dizziness—symptoms that usually resolve with proper hydration and rest. Red-flag symptoms that require immediate medical attention include:

• Sudden or persistent abdominal pain or cramping.
• Vaginal bleeding or spotting.
• Rapid heartbeat that doesn’t settle after a cool-down (above 160 bpm).
• Shortness of breath at rest, severe headache, or visual disturbances.
• Swelling of hands/feet accompanied by sudden weight gain.
• Leaking amniotic fluid or a sudden gush of fluid from the vagina.
• Decreased fetal movement after exercise.

If any of these occur, stop exercising, sit or lie down, and call your provider right away. It’s also a good idea to familiarize yourself with the signs of preterm labor, such as regular contractions, lower back pain, or pelvic pressure, as these can sometimes be mistaken for normal pregnancy discomfort.

Understanding Braxton Hicks contractions

Braxton Hicks contractions are “practice” contractions that many pregnant people experience, especially in the third trimester. They’re usually painless and irregular, but they can feel like a tightening or squeezing sensation in your abdomen. While Braxton Hicks contractions are normal, it’s important to know how to tell them apart from real labor contractions.

Here’s how to distinguish Braxton Hicks from true labor:

• Frequency: Braxton Hicks contractions are irregular and don’t get closer together over time. True labor contractions become more frequent and regular.
• Duration: Braxton Hicks contractions are usually short (30 seconds or less) and don’t last longer over time. True labor contractions last longer (45–60 seconds or more) as labor progresses.
• Intensity: Braxton Hicks contractions are usually mild and don’t get stronger over time. True labor contractions become increasingly intense.
• Location: Braxton Hicks contractions are often felt in the front of the abdomen. True labor contractions usually start in the back and move to the front.
• Response to movement: Braxton Hicks contractions often go away when you change positions or move around. True labor contractions continue regardless of movement.

If you’re unsure whether you’re experiencing Braxton Hicks or true labor, call your provider. It’s always better to err on the side of caution, especially if you’re preterm (before 37 weeks).

Safer alternatives

• Prenatal yoga: Gentle stretching and breathing, proven safe by ACOG. Helps with flexibility, relaxation, and pelvic floor