Targets: Butt and hamstrings
-- Lie faceup on ground with arms slightly out to sides, knees bent and calves resting on center of stability ball, feet flexed.
-- Lift hips off ground and bend knees to bring stability ball toward you.
-- Keeping hips lifted throughout, extend legs to roll ball back to start and repeat curl.
-- Do 3 sets of 12 to 15 reps.
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