This low impact move targets the arms, back, chest, abs, butt, and hamstrings. 1. In the deep end, tread water, making small circles with cupped hands, and lift right leg straight in front of you at hip level while reaching toes of left leg toward bottom of pool. 2. Hold for 5 seconds. 3. Switch legs quickly, bringing right leg down as you raise left leg, and hold for 5 seconds. 4. Continue for 30 seconds, alternating sides. Tip: Squeeze your glutes and quads to keep your legs straight.