Describe the take-off in Long jump

It begins with the athlete planting their take-off foot firmly and flatly on the take-off board, typically with a slightly flexed knee. As the foot makes contact, the body is still moving forward, causing the center of gravity to pass over the take-off foot. This creates a powerful upward and forward drive. The take-off leg rapidly extends at the hip, knee, and ankle (triple extension), while the free leg (swing leg) is aggressively driven upwards and forwards, often with the knee bent at about 90 degrees. Simultaneously, the arms swing powerfully, usually in opposition to the legs, to generate additional upward momentum and maintain balance. The goal is to achieve an optimal take-off angle (typically between 18-25 degrees) while minimizing the loss of horizontal speed, propelling the athlete into the flight phase.