It could be a flexibility problem, not a strength problem. I am (by nature, I think) exetremely un-flexible. I started doing regular stretches and occasional yoga and, boy, my hamstrings, knees, calves, quads, back, abs... they are all better for it. Stretching sucks big-fat-harry-ones at first, but it is worth it once you become more flexible.

Peace,
Gavin

I ride. I fall down. I get up.
Meanwhile, I keep dancing.