VOLLEYBALL FLATTENS THE BELLY

Playing a pick-up game of volleyball will work double-duty to carve out a taut middle like the British beauty’s, promises Haley. Maintaining balance as you bump, set and spike the ball engages the deep-tissue transverse abdominis that cinch in lower-belly bulge. And since dashing up and down the court torches 300 calories in 30 minutes, you’ll quickly trim inches to reveal lean muscles underneath.

TO TONE EVEN FASTER: Jump up every time you hit the ball. This will engage the glutes and hamstrings to tone the butt and thighs.