You should already be able to do a jump with some air. Find a table jump that you feel comfortable with. If you have a telescopic support, you are welcome to lower it. You should definitely wear pads when practising.
I start with enough momentum - just fast enough to make it to the landing. In my whip variation, I head straight for the jump. I push off a little harder than usual to get more air.
As soon as my wheels leave the ground, I initiate the whip impulsively but dynamically. I push the rear end to the side from the hips and turn the handlebars at the same time. My centre of gravity is at the front. My arms and legs are almost straight.
My eyes are focussed on the landing during the whole ride. To rebalance the bike, I straighten the handlebars and my hips push the rear back into the track. My outstretched legs and arms cushion the landing.
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