This is a great thigh and butt exercise from Tony Horton, the creator of P90X. If you want to tone your butt and thighs, try the Screamer Lunge—a new twist on lunges. Start in a low runner’s stance, with your back leg parallel to the ground and your front leg bent at a 90-degree angle—or the deepest part of a lunge. In one move, bring the leg up and jump off the ground, landing softly on your front leg, returning to the deep lunge position. Go at your own pace and keep your balance during this butt and thigh exercise. Do 15-30 reps on each side, two sets each.
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