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How to do to back walkovers on the beam
Start with your dominant leg and toe pointed right in front of you.
( you will be standing on your non-dominant leg. ) extend your leg as far out as you can.

Possible answers:
1). Go side to side and straighten your leg so that your knee is directly in front of you. Bring your dominant foot forward just as you would for your vault leg (keeping your foot flat, except for your right foot and toe)..
2). Grab the beam with your non-dominant hand with your left. Grip the beam with your left hand and your right hand with your right..
3). Extend your legs backwards but keep your knee flexed. Bend your knees (and use them to support yourself as you back up..
4). Lift your dominant leg up as high as you can. Keep your upper body up at this point..
Answer:
4).