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Summary: Improve core and leg strength with the double leg stretch. Learn how to do this exercise with stability balls in this free video from a certified Pilates instructor.
"In double leg stretch we can again use the ball in two ways. One we can have it in the hand, and the other we can put it between the legs. So I'll show you the exercise first with having the ball in the hands, and it just increases the lever a little bit. Take a nice inhale, tuck the chin, and exhale, flex the torso up, inhale hold, exhale extend; inhale come in; again slow and controlled, keeping the ribcage down when you extend; exhale extend, inhale come in. Now a modification of that is to put it between the legs, and inhale hold, exhale hold; inhale extend, exhale, squeeze that ball and bring it back in; inhale extend, keep the ribcage down, exhale, squeeze and bring it in; inhale extend, exhale, squeeze and bring it in. Remove the ball from the legs, go ahead and curl down, and relax."
eHow Article: Pilates Ball Exercise: Double Leg Stretch