Staying active during pregnancy is safe for most women and brings real benefits: better energy, less back pain, easier labor recovery, and lower risk of gestational diabetes. The general target is at least 150 minutes of moderate-intensity activity per week, spread across most days. That said, “getting in shape” while pregnant looks different than it does outside of pregnancy. The goal shifts from performance to building functional strength, maintaining cardiovascular fitness, and preparing your body for delivery and recovery.
How Hard You Should Push
The simplest way to gauge intensity is the “talk test.” If you can hold a conversation but not sing comfortably, you’re in the right zone. The more formal version of this is a perceived exertion rating of “somewhat hard,” which means you feel like you’re working but not straining. Heart rate targets vary too much from person to person during pregnancy to be reliable, so how you feel is the better guide.
If you were sedentary before pregnancy, start with 10 to 15 minutes of walking or swimming and add five minutes each week until you reach 30 minutes most days. If you were already active, you can generally continue your routine with modifications as your pregnancy progresses. The key principle: maintain fitness rather than chase new personal records. Pregnancy is not the time to start a high-intensity training program you’ve never done before.
Best Types of Exercise
Walking, swimming, stationary cycling, and prenatal yoga are the most commonly recommended options because they’re low-impact and easy to scale. Swimming is particularly useful in the second and third trimesters because the water supports your weight and reduces joint stress. Prenatal yoga builds flexibility and body awareness, though you’ll want to avoid deep backbends and any pose that puts pressure on your belly.
Strength training is also safe and genuinely helpful. Building strength in your legs, glutes, and upper back prepares you for carrying extra weight, pushing during labor, and the constant lifting that comes with a newborn. There’s no official cap on how much weight you can lift, but the practical advice is to use lighter loads with more repetitions and focus on controlled form rather than maxing out. If a weight forces you to hold your breath or brace hard, it’s too heavy.
Exercises to avoid include contact sports, anything with a fall risk (skiing, horseback riding, mountain biking), hot yoga or exercising in extreme heat, and scuba diving. After about 20 weeks, skip any exercise that has you lying flat on your back for more than a few minutes. At that stage, the weight of your uterus compresses major blood vessels against your spine, reducing blood flow back to your heart and potentially causing dizziness or lightheadedness. Side-lying, incline, or standing positions are easy swaps.
Protecting Your Core and Pelvic Floor
Traditional ab exercises like crunches, sit-ups, full planks, and double leg lifts can worsen a common condition called diastasis recti, where the two sides of your abdominal muscles separate along the midline. This happens to some degree in most pregnancies, but certain movements accelerate it. Any exercise that causes your belly to bulge, cone, or dome outward is a sign you should stop that movement.
The exercises that actually help are ones targeting the deep core muscles underneath. These typically involve slow, controlled breathing paired with gentle engagement. A basic example: lying on your side, inhale to let your belly expand, then exhale while gently drawing your lower belly inward as if you’re zipping up a tight pair of pants. Pelvic floor exercises (Kegels) pair well with this kind of deep core work and help prepare you for delivery and postpartum recovery. A pelvic floor physical therapist can assess your specific needs and make sure you’re doing these correctly, which matters more than most people realize.
Adjustments by Trimester
First Trimester
Fatigue and nausea may be your biggest barriers, not physical limitations. If you feel terrible, shorter sessions still count. Even 10 minutes of movement on a rough day is better than nothing. Your body isn’t significantly different yet in terms of balance or joint changes, so most exercises you were doing before pregnancy can continue as-is.
Second Trimester
Energy often returns, making this the trimester where many women feel strongest. However, a hormone called relaxin is now loosening your ligaments, muscles, and joints to make room for your growing baby. This makes you more flexible but also more prone to sprains and overstretching. Avoid pushing into deep stretches or bouncing at end range. Your center of gravity is shifting forward, so balance-heavy movements may start to feel less stable. Switch from barbell back squats to goblet squats, for example, or use machines instead of free weights if you feel unsteady. Stop exercising flat on your back after 20 weeks.
Third Trimester
Everything gets harder simply because you’re carrying significantly more weight and your lungs have less room to expand. Reduce intensity and duration based on how you feel. Walking, swimming, and gentle strength circuits are excellent choices. Wide-stance movements accommodate your belly better. This is a good time to prioritize pelvic floor work and breathing exercises that will directly help during labor.
Fueling Your Workouts
Pregnant women need roughly 300 extra calories per day beyond their pre-pregnancy intake, with needs increasing as the pregnancy progresses. A practical breakdown: about 1,800 calories daily in the first trimester, 2,200 in the second, and 2,400 in the third. If you’re exercising regularly, you may need slightly more, especially on active days. Undereating while exercising is a real risk and can leave you feeling depleted and dizzy.
Hydration matters more during pregnancy because your blood volume increases significantly. Aim for 64 to 96 ounces of water per day (8 to 12 cups), and drink extra before, during, and after workouts. Dehydration can trigger contractions and raise your core temperature, both of which you want to avoid. If your urine is pale yellow, you’re in good shape.
When to Stop and Reassess
Certain symptoms during exercise mean you should stop immediately: vaginal bleeding, fluid leaking, chest pain, calf pain or swelling, dizziness, headache, shortness of breath before you even start moving, or regular painful contractions. These warrant a call to your provider, not a “push through it” mentality.
Some medical conditions rule out moderate to vigorous exercise entirely. These include placental abruption, severe preeclampsia, active preterm labor, cervical insufficiency, and severe heart or lung disease. Other conditions, like mild preeclampsia, well-controlled type 1 diabetes, placenta previa after 28 weeks, or untreated thyroid disease, don’t necessarily mean no exercise, but they do mean working closely with your provider to modify what you do.
What “In Shape” Realistically Looks Like
Getting in shape during pregnancy means building a body that handles the demands of pregnancy, labor, and early parenthood well. It means cardiovascular fitness that keeps your energy up, leg and back strength that supports the extra 25 to 35 pounds you’ll carry, a pelvic floor that functions well during and after delivery, and enough stamina to recover faster postpartum.
It does not mean visible abs, weight loss, or hitting PRs. The women who feel best during and after pregnancy are typically the ones who stayed consistently active at a moderate level rather than those who trained hard in bursts. Consistency at a sustainable intensity is the entire strategy. Even after delivery, the loosening effects of relaxin stick around for several months, so the gradual, controlled approach to exercise should continue well into the postpartum period.