The explosive snap of the tail that triggers every jumping trick. The board only leaves the ground once the front foot slides forward in the same instant. Measured thrust: roughly 2.2 times body weight.
Pop is half of every jumping trick: without it the board stays on the ground no matter how high you jump. The classic mistake is treating it in isolation — you snap the tail, but the front foot doesn't slide forward along the griptape in the same instant. Your body leaves; the board doesn't. Both movements belong in the same split second. What tends to get overlooked: the pop isn't the dangerous part. Landing an ollie down off a platform was measured at roughly 4.7 times body weight, arriving within 30 to 80 milliseconds. That's why deeply bent knees on touchdown are joint protection rather than style — and why you drill the ollie standing still before you drill it rolling.