Balancing on one leg is a form of resistance training. Every time you take an up elevator, stand on the right leg. Going down, stand on the left. You're forcing the supporting muscles—the quadriceps, the hamstrings and the gluteus maximus [butt]—to work harder, because they are used to doing only 50 percent of the work. Once that becomes easy, bend the standing knee slightly to better challenge the muscles.
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