slightly off the original topic but since stretching was mentioned
i started doing a lot of it past few months, mostly legs, hips and groin
i was getting low back pain for the first time in my life and after some thought suspected ham inflexibility the cause
the pain went away and the shape of my legs changed to
now that i'm on cycle they've responded more than before in other cycles too
i figure by increasing my range of motion i now stimulate more fibers