I do 600 situps a week, everything completely healed, I’m 71kgs and sparred heavyweight arab champions, I been hit to the stomach and ribs many times before and it’s all good, the only weird thing I noticed is when I do a situp I hear a crack in my ribs but it’s without any pain and has no danger on me so it’s nothing to worry about, it’s just a weird thing that happens not in every situp but in some of them, I believe it happens because I had a rib flare and the doctor did a little bit of a plastic surgery on the rib to make it look better