Exercises for the Second Trimester?

At this point you should avoid lying flat on your back for any length of time — it can reduce blood flow to baby. Otherwise, just keep listening to your body, and steering clear of contact sports and anything where you’re likely to fall or get hurt. No skiing or skydiving until after delivery.

Plus, more from The Bump:

Exercise Dos and Don’ts During Pregnancy

Pregnancy Workout Plan

When Should I Change My Sleep Position?