I did leg extensions this week instead of squats just because I was in need of a small change up for a the next couple of weeks before it's back to squats (I switched up all my regular exercises to isolation exercises, just to see what I could do).
Anyways, when doing heavy LE this week, I feel fine but then get ab pains the next day. DOMS of sorts. Is this just me squeezing my stomach during contractions of the quads? I'm lifting 5 sets of 5 at the max weight of approx 275lbs on all sets (Doesn't go any higher). I just want to know if what suspect is the cause really is the cause. Next week I'll be doing Sissy Squats (Or trying to anyways).