Lie on your back and raise your legs. Bend your knees 90 degrees and spread them apart while keeping the bottoms of your feet together. Lift a kettlebell straight above your head, holding the sides of the handle in both hands. Lower the weight behind you, stopping a foot off the floor. Hold for 30 seconds, and lift it back above your head. That's one rep. Do five. Why It Works: "Pulling things overhead while lying on your back is what you did when you were a baby," says Hartman. "It's a natural movement that perfectly aligns your extremities and loads your trunk, activating and strengthening your core."
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