TO TRIM A MUFFIN TOP: ROCKETMANS

When crunches fail, rocketmans come to the rescue: They target the erector spinae, the muscles that wrap around the lower back to lengthen the spine and banish over-the-belt flab, says Driver.

To do: Lie flat on your stomach with your legs hipwidth apart. Fold the band in half twice and hold the ends behind you with your palms facing up. Squeeze your legs into the ground and lift your upper body. Hold for a moment, then lower down. Do 5 reps.