Get slimmer and stronger with these easy-to-do power moves.
Sit on a step with your feet and knees together. Place your hands on the step behind you, fingers facing forward. Straighten your arms to lift your hips off the step. (Don't lock elbows.) Hold this position for 1 minute. If you need to rest, do so, then resume the up position for the remaining part of the minute once you've recovered. Repeat twice.