Exercise is GOOD – but be Cautious…
Exercise is very important, but being aware of what you should NOT do is even MORE important.
Here are 4 Exercises that should be avoided during pregnancy.
1. Avoid deep knee bends (and be careful with squats!) – Because the body loosens up SO much during pregnancy, any bending past 90-degrees while holding heavy weights is not recommended!
Why not try ball squats, but only do them if you feel OK (STOP if you feel any discomfort) 
2. Avoid lifting over your head (i.e. standard military press) – Because a lot of women hold their breath when they lift overhead (possibly causing them to feel dizzy and pass out), be cautious of this exercise.
Also, because of the increased lordotic (lower back) curve associated with pregnancy, overhead exercises can place even more stress to the lower lumbar area, causing lower back strain. If you’re committed to lifting overhead – an inclined position may feel better and take the pressure off your lower back.
3. Avoid any “Weight-Bearing” exercises that require you to bend from your waist and compress your abdominals (i.e. deadlifts) – This can cause dizziness and puts pressure on your lumbar spine.
4. Avoid extreme stretching or bouncy movements – Your flexibility has increased greatly, which CAN and does lead to overstretching (painful!) if you’re not careful.
Although Yoga is recommended – overstretching is something to watch out for! Listen to YOUR body, not what the teacher says or someone else in the class is doing.
But don’t let RULES hold you back!
It’s important to be cautious but DON’T let all these “RULES” keep you from exercising. Exercise WILL help you both during your pregnancy and beyond (including post-baby WEIGHT LOSS!).