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Start with your feet together and take a large step behind you with your left leg. Bend both knees and drop straight down toward the floor until both knees and hips make 90-degree angles, bringing your arms forward. Push off your left foot, and as you extend your right leg, straighten your left and lift it behind you as you press your arms back. Replace your left foot on the floor and go right into the next rep. Complete all reps on one side, then switch.