[lumberjim]

I'm saying stretch them specifically before you do leg curls. make them longer AND stronger.

glute bridge:
http://www.coreperformance.com/knowl...-baseball.html
hammy stretch:
http://www.coreperformance.com/knowl...g-stretch.html

also, you can lie on your back, and get a rope looped around your foot, and stretch your leg up

and for the quad:

http://www.coreperformance.com/knowl...-kneeling.html

i have a few good emails from our trainer if you want, I'll forward to whoever wants them.