Sit ups causing severe stomach pains.? I have been trying to do sit ups, but it is hurting when I do.  I can do other stomach flattening excercises with no problems, and I can do many reps, 30 or more depending on what I am doing.  My back is fine, nothing else hurts.  But 'proper' sit ups for Basic Training I am not able to do, I am joining the ARMY National Guard.  The pain is searing, it feels as if I am being kicked in the gut.  As much as I try, I can not get one out of the way, the pain is unbearable, and I have a high tolerance for pain.  It will also be quite painful in my stomach when I try to stand straight for a few minutes afterwards.

I know recruits are required to do these types of sit ups.  As I said, I can do most stomach flattening excercises, and before anyone says so.. I know sit ups are not the best excercise for flattening.  This is for Boot Camp.

Thanks

Summarized question: Why are sit-ups causing severe stomach pains?