In reply to alpchild004: Hamstring exercise, super important to balance muscles and protect ACL, like Ali Gibb says. I.e. Lay on your back, bum off the ground and walk your feet in and out... with lots of variations, like rolling the foot out and in on a swissball, 1 legs versions etc.
Also, hip abductors are apparently real important (glutus medius i think). lay on your side and lift the leg straight up to ceiling, repeat until you get a crazy pump and burning muscle in your hip!
Put together your own circuits and build up to 60secs per exercise for like 8 stations of different things, quads, core, hammies, calfs.
Very boring