While practicing laybacks my troupemates had the typical pain in their thighs from over stretching, etc. I however had severe hip pain. My legs don't straighten all the way unless sitting on the floor...any other time they won't go straight because my hips lock up. Is this normal? Does anyone else have this problem? My thighs didn't hurt at all and if my hips hadn't been hurting so bad I would have been able to do the laybacks without any problem...I can do them but my hips just aren't right and I'm afraid of hurting myself. Is there anything I can do to fix the prob?

Also, for a few days afterwards my left knee hurts really bad...to the point where I can't do squats and it hurts to stand up...is that normal?

Geesh!