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this is description of cutted video clip exercises:
6. Tuck backflip
In this stage of practising you will easily push your friend into nice rotation. I suggest that after the push turn around to help him in landing. After all if you did not give him an adequate push, when you turn slightly pushing his shoulders or chest up will help him not land on head or on hands.
7. Backflip
We suggest two assisting guys. Now let me explain the assistance: when you stand by friend your hand which is closer to the point of jump while assisting is on backside of the leg, and hand which is closer to the landing point going on the middle of the back. Now each hand have different job, "leg hand" gives a rotation and "back hand" gives a hight.