Ow, ow, ow. Picture this: you're in a plank on your weights, you do a push-up, then push up to a t-position (twisted over to one side, one hand (holding the weight) up over your head) then back to plank, do a push-up, then a T on your other side, back to plank and do a push-up . . . ay-yi-yi!
That's just one of the circuits. Oof. I hurt.