Lie down on the floor sideways, so that one shoulder, arm and leg are against the ground.
Keeping your body thus aligned, lift your other leg and lower it without touching the other leg.
Do 2 sets of 10 reps each, then change sides and repeat.
Caption: If you like voluptuous women, actress Scarlett Johansson [Images] probably counts as a dream date -- the sexy star credits her spectacular derriere to playing tennis as a child.
Photograph: Kevin Winter/Getty Images
Also see: Rihanna has 'Sexiest Stomach in the World'
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