If you are pregnant then you go to the doctor and get a note for gym that you cannot participate in group sports, any abdominal work, weight lifting over 25lbs, and anything with a risk of fall or getting hit by the ball etc. That what my doctor gave me. I was fine up to 7months but after that when I tried doing gym I started getting contractions and pains so my doctor gave me a note that I'm excused from gym. Its important that you do this as soon as you can so any risk to the baby will decrease. Get a appointment at a clinic if you're preg because usually you don't get to see a OB till 9 -12 week into pregnancy and you really need that note. I was pregnant in the summer so before I went back to school I had my note. Good Luck