1990s...
The trick to a 90 is your form going into it. You may first get the feel to it, by standing on your hands and winding your legs in a circular motion. build your shoulder stength. Doing a 90> As you place your first arm down, swing the opposite leg of the arm you just used swing that leg up in a circular motion and open both legs wide on one arm. The second you have both legs open on one arm,Slightly shift your weight onto your other arm. The minute your on both hands try to focus your energy on winding your legs shut.At the same time lifting up your first arm and balacing yourself on your spinning arm. On your hand,spin on the lower part on your hand opposite you thumb. Also look down at your hands as your spinning.
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