Several categories of yoga poses carry real risks during pregnancy, from lying flat on your back after the first trimester to any pose that compresses your belly or raises your core temperature. The good news is that yoga itself is considered safe and beneficial during pregnancy. The key is knowing which specific positions to skip and why, so you can keep practicing with confidence.
Hot Yoga Is the Clearest “No”
Bikram and other hot yoga styles, practiced in rooms heated to 95°F to 104°F, pose the most straightforward risk. An elevated core body temperature during the first trimester is linked to a twofold increased risk of neural tube defects, which are serious problems with brain and spinal cord development. Research on external heat sources like hot tubs found that repeated exposure in the first trimester also raised the risk of other birth defects, including abdominal wall problems.
This isn’t about mild warmth. The concern is sustained heat that pushes your core temperature up. A regular-temperature yoga class where you break a light sweat is fine. A 90-minute session in a room deliberately heated above body temperature is not.
Poses Flat on Your Back
After the first trimester, lying flat on your back for more than a few minutes can trigger something called supine hypotensive syndrome. As your uterus grows, its weight presses down on the large vein (the inferior vena cava) that returns blood from your lower body to your heart. This reduces blood flow back to your heart and can cause dizziness, nausea, and lightheadedness.
Some women develop collateral blood vessels that compensate for this compression, and they may feel perfectly comfortable on their backs well into the third trimester. Others feel symptoms quickly. Since you can’t predict which group you’ll fall into, it’s safest to modify any pose that has you flat on your back after roughly 20 weeks. Savasana (corpse pose) is the most common example. Simply lying on your left side or propping your upper body at an angle with a bolster keeps the weight off that vein.
Belly-Down Poses
Poses that have you lying face down, like cobra, locust, and bow pose, become impractical and uncomfortable as your belly grows. Beyond discomfort, they put direct pressure on the uterus. Most women naturally stop these by the end of the first trimester simply because the position feels wrong, but it’s worth flagging them early so you can plan modifications. Sphinx pose with a bolster under your chest, or cat-cow on hands and knees, can give you a similar back extension without the belly compression.
Deep Twists That Compress the Abdomen
Not all twists are off limits, but “closed” twists are. A closed twist is any twisting pose where your torso rotates toward your bent or crossed leg, squeezing your belly between your thigh and spine. Revolved triangle, revolved side angle, and seated spinal twists done in the traditional direction all fall into this category. They compress the abdomen, restrict blood flow, and put pressure on the uterus.
The fix is to twist “open” instead: rotate away from the bent leg so your belly has room. You can also keep twists gentle and focused on the upper back and chest rather than cranking through the lower back. This gives you spinal mobility without the squeeze.
Intense Core Work
Poses that heavily load the front abdominal wall increase the risk of diastasis recti, a separation of the two sides of the rectus abdominis muscle that runs down the center of your stomach. This separation is already common in pregnancy as the belly expands, and forceful core exercises can make it worse.
Poses to skip include boat pose, full plank holds, any variation of crunches, and double leg lifts. A useful visual cue: if your belly bulges outward in a ridge or cone shape during a core exercise, that’s a sign you’re putting too much pressure on the midline. Gentle core engagement through modified side planks or bird-dog (opposite arm and leg extension on hands and knees) is generally a safer way to maintain stability.
Inversions and Balance Poses
Headstands, handstands, and shoulder stands are commonly advised against during pregnancy. The primary concern is falling. Your center of gravity shifts forward as pregnancy progresses, and a hormone called relaxin loosens the ligaments and joints throughout your body to prepare for delivery. That combination makes you less stable than usual, and a fall from an inverted position carries serious risk of abdominal trauma.
Even if you had a strong inversion practice before pregnancy, the stability you’re used to may not be there. Relaxin affects muscles and ligaments around the pelvis, back, and abdomen, and the resulting looseness can make you feel unsteady in ways that are hard to anticipate. Legs-up-the-wall (with your back slightly propped, not flat) is a gentler alternative that gives you some of the circulatory benefits of an inversion without the fall risk.
Deep Backbends and Overstretching
Full wheel, deep camel, and other intense backbends stretch the abdominal wall aggressively and can worsen diastasis recti. They also place significant load on the lower back, which is already under strain from the weight of your growing belly pulling your spine into a deeper curve.
The relaxin factor matters here too. Because your joints and ligaments are looser than normal, you can push further into a stretch than your tissues can safely handle. What feels like a great opening in the moment can result in a sprain or strain that takes much longer to heal during pregnancy. A good rule of thumb: stretch to about 80% of your usual range. If a pose feels dramatically more flexible than it did before pregnancy, that’s relaxin talking, not a fitness breakthrough.
Forward Folds With Legs Together
Standing or seated forward folds done with your legs close together compress the belly against the thighs. This is both physically difficult as your belly grows and counterproductive, since it puts pressure on the abdomen and the organs inside it. The simple modification is to widen your stance or separate your legs to create space for your belly. A wide-legged forward fold gives you the same hamstring stretch without the compression.
Warning Signs to Stop Immediately
Regardless of which poses you’re doing, certain symptoms during any yoga session mean you should stop right away: vaginal bleeding, fluid leaking from the vagina, unusual pain, dizziness, a racing heartbeat or chest pain, uterine contractions, or unusual shortness of breath that doesn’t match your effort level. Feeling overheated, excessively fatigued, or crampy are also signals to rest. These symptoms don’t necessarily mean something is wrong, but they warrant a pause and, if they persist, a call to your provider.
What’s Still Safe
The list of what to avoid can feel long, but most of a standard yoga class is still available to you with minor modifications. Cat-cow, warrior poses, goddess squat, side-angle pose, tree pose (near a wall if needed), and gentle hip openers like pigeon are all commonly practiced throughout pregnancy. Prenatal yoga classes are specifically designed around these modifications, so they’re a good option if you want to practice without constantly thinking about what to skip.
The American College of Obstetricians and Gynecologists considers physical activity during pregnancy safe and desirable in the absence of complications. Yoga fits well within that guidance. The goal isn’t to avoid movement. It’s to avoid the specific positions that compress, overheat, destabilize, or strain your body during a time when it’s already working hard.