Many people discover they’re pregnant and immediately worry: Is it safe to keep working out? Will activity hurt my pregnancy? If you’re wondering whether you’re pregnant, or if exercise is safe during early pregnancy, you’re not alone. The answer is nuanced — and it starts with confirming your pregnancy and understanding your own risk profile. Before you change anything, confirm your pregnancy with a free ultrasound at CHOICES — then you’ll know exactly where you stand and can make informed choices about staying active.
For most healthy pregnancies, staying active is one of the best things you can do in the first trimester. The American College of Obstetricians and Gynecologists (ACOG) recommends about 150 minutes of moderate activity each week — think brisk walking, swimming, or stationary cycling. If you were already running or lifting before pregnancy, you can usually keep doing what you were doing.
Is first trimester exercise safe?
Yes. For a healthy, low-risk pregnancy, moderate exercise in the first trimester is safe and comes with real benefits — better sleep, steadier mood, less back pain, and easier recovery later on.
ACOG recommends about 150 minutes of moderate-intensity aerobic activity per week during pregnancy. — American College of Obstetricians and Gynecologists
Good first-trimester options include:
- Walking
- Swimming or water workouts
- Stationary cycling
- Modified yoga or Pilates
- Light strength training
If you already run or lift weights, you can generally continue. Your body is the best guide — aim for a pace where you can still hold a conversation.
What should you avoid during the first trimester?
A few activities carry more risk during pregnancy and are best set aside. The goal is simple: protect yourself from falls, hard impacts, and overheating.
Avoid these while pregnant:
- Contact sports (soccer, basketball, kickboxing) — these pose a fall risk and expose your abdomen to sudden trauma that could harm a developing pregnancy.
- Activities with a high fall risk (skiing, horseback riding, mountain biking) — a fall that might be minor before pregnancy can have more serious consequences when you’re expecting.
- Hot yoga or hot Pilates — exercising in high heat environments can raise your core body temperature significantly, which puts stress on fetal development, especially in the first trimester.
- Scuba diving — pressure changes underwater can introduce gas bubbles into the fetal circulation, which has no safe threshold during pregnancy.
You don’t have to stop moving — you just swap higher-risk activities for gentler ones that keep you strong and comfortable.
How do you exercise through nausea and fatigue?
First-trimester nausea and tiredness are real, and they can make working out feel impossible. Be gentle with yourself and adjust rather than quit.
Work with your energy, not against it
Move during the part of the day you feel best — for many people that’s mid-morning. A short 10-minute walk still counts. Some movement is always better than none.
Small, steady steps
If a full workout feels like too much, break it into pieces. Two or three short walks add up to the same benefit as one longer session. Stay hydrated and eat a light snack beforehand to steady nausea.
How do you stay safe exercising in hot climates?
If you live somewhere with intense heat, staying safe during outdoor workouts requires extra planning. Overheating is one of the few real first-trimester risks, and it’s easy to prevent.
Beat the heat
- Exercise in the early morning, before temperatures peak
- Choose indoor options — a gym, a pool, or a climate-controlled space
- Wear loose, breathable clothing
- Drink water before, during, and after every session
If you feel dizzy, overheated, or your heart is pounding, stop and rest in a cool place. There’s no prize for pushing through extreme heat during pregnancy.
When should you stop and call your provider?
Stop exercising and call your provider right away if you notice any warning sign. These are uncommon, but knowing them helps you feel confident, not fearful.
Stop and call if you experience:
- Vaginal bleeding
- Painful or regular contractions
- Fluid leaking from the vagina
- Dizziness or feeling faint
- Chest pain
- Calf pain or swelling
- Shortness of breath before you start exercising
Some people should check with a provider before beginning any routine — including those with heart or lung conditions, high blood pressure, or a history of pregnancy complications. When in doubt, ask first.
Confirm your pregnancy before you change your routine
Before you rethink your workouts, it helps to know two things: that you’re pregnant and how far along you are. A free ultrasound at CHOICES confirms both, so you can make choices with real information instead of guesswork.
Not sure yet? Start with a free pregnancy test at one of our centers. You can also learn about timing in our guide on how soon you may need a prenatal ultrasound, and explore free LifePath education classes for women and men when you’re ready for support at your own pace.
Care at CHOICES is private, judgment-free, and offered at no cost.
Frequently asked questions
Can I keep running in early pregnancy?
If you were a runner before pregnancy and your pregnancy is healthy and low-risk, you can usually keep running. Listen to your body, stay hydrated, and slow down if you feel dizzy or overly tired. Check with your provider if you have any concerns.
How much should I exercise in the first trimester?
ACOG recommends about 150 minutes of moderate activity per week — roughly 30 minutes on most days. You can split that into shorter sessions if nausea or fatigue makes a full workout hard.
Is it safe to lift weights while pregnant?
Light to moderate strength training is generally safe in a healthy pregnancy, especially if you lifted before. Avoid holding your breath while straining, and skip very heavy maximal lifts. Talk with your provider if you’re unsure.
Does exercise cause miscarriage in early pregnancy?
Moderate exercise does not cause miscarriage in a healthy pregnancy. Staying active is linked to healthier outcomes. If you have bleeding, cramping, or other warning signs, stop and call your provider.
Before your first visit: bring a valid photo ID. Care at CHOICES is private, judgment-free, and offered at no cost.
