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Please remember, as with any exercises, to start at a level that is comfortable for you & that does not cause pain.
Leg Raise Seated
Sit on gym ball in readiness position with feet flat on floor.
Keeping balanced, raise and extend one leg straight out in front.
Lower leg to floor and repeat with opposite leg.
Sit on gym ball in readiness position, hands resting on sides of ball.
Maintaining balance and readiness position, raise one foot up off the floor as if to march.
Return foot to floor and repeat with opposite foot.