How does correct leg extension improve the delivery of force in a yoko-geri?

Correct leg extension in Yoko-geri (side kick), a linear kicking technique delivered sideways, significantly improves the force delivered by maximizing the transfer of momentum and optimizing the lever system. A fully extended leg creates a longer lever, increasing the velocity of the foot at the point of impact. The longer the lever, the greater the potential force generated, given equal effort. Complete extension also ensures that the impact is focused on the intended target, rather than being dissipated through a bent knee. This concentration of force maximizes the effectiveness of the kick. Furthermore, proper leg extension engages the core muscles and hip stabilizers more effectively, leading to a more stable and balanced delivery. The core muscles act as a bridge between the lower and upper body, facilitating the transfer of power from the ground up. Incomplete extension reduces the engagement of these muscles, diminishing the overall power of the kick. Therefore, correct leg extension in Yoko-geri is essential for maximizing both the force and precision of the kick.