THE CORE Your legs propel you, but it’s your back and abdominal muscles that enable a lot of the power. For the back, do pulldowns and rows at a gym, with your shoulder blades pinched together. If you practice yoga, concentrate on backbend moves like the locust, the bridge, and the boat. For the abs, work exercises into your routine that involve keeping your pelvis still while moving your legs. Planks are some of the simpler and most effective of these exercises. For the front plank, lie flat on a mat, face down, then raise your hips and pelvis, keeping your forearms and toes on the floor with
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