In my DVD, I speak several times about the importance of propelling the body forward with the back leg and foot, allowing toe-off to be complete. It’s common, in places where space is at a premium (e.g. crowded sidewalks, corridors between work cubicles, small kitchens) for us to pull ourselves forward with the leg that swings forward, rather than propelling our bodies forward from the back leg. When the body is drawn forward from the forward heel, the hamstring muscles don’t complete their potential for movement which is to extend the hip enough to take the leg behind the body.  When the hip doesn’t fully extend, the hamstrings are robbed of the opportunity to let go during the swing phase of the walk.  This is the scenario of perpetually tight hamstrings…