Post-workout, the two most common stretches seem to be the standing quad stretch and just about any hamstring stretch, and they are usually done in that order. But if you tend to cramp in the backs of your legs, I highly suggest switching it up. Since the quads, on the front of the thigh, and the hamstrings, on the back, are antagonist, one tends to engage as the other stretches. If you have really tight hamstrings, pulling your heel to your booty to stretch your quad can engage muscles on the back of the thigh, making it cramp unpleasantly. Before you stretch your quads, lengthen the back of your legs first with one of these easy hamstring stretches. Once you have stretched your hamstrings, then move on to stretch the front of your legs.
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