Describe the take-off in high jump

It involves a rapid, powerful, and coordinated action of the entire body, typically occurring from a single foot. As the athlete approaches the take-off spot, they lower their center of gravity slightly, then plant their take-off foot firmly and actively into the ground, usually with a heel-to-toe roll. Simultaneously, the free leg is driven upwards and forwards, and both arms are swung powerfully upwards to contribute to the vertical impulse. This explosive extension of the take-off leg, combined with the upward drive of the free leg and arms, propels the athlete into the air, initiating the flight phase over the bar.