Use this Swiss-ball workout to build more explosive power, increase your personal bests, and—let’s face it—boost your sex appeal. Your glutes do more than just round out the back of your pants.

Lie down with your feet on the Swiss ball, knees bent to 90 degrees and hands by your sides (without pushing on the floor), neck relaxed. Press your hips upwards toward the ceiling, squeezing the ...

Aim for eight to 16 repetitions every day. It'll cost you 5 minutes but save months on the DL. Adapted from Core Performance, by Mark Verstegen, M.S., C.S.C.S. Lie on a Swiss ball with your back flat ...