Leg on Exercise ball crunch video
1. place the exercise ball on the floor.
2. lay down on the floor and place your foot on the exercise ball
3. use your leg to roll the ball toward yourself until you knee bent 90 degree.
4. with your lower back on the floor, contarct your abs while your hand behind your head
5. exhale when you lift your body up, inhale when you lower your body
6. do 3-4 set of 15 – 20 rep
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