It is essential not only in the diet of athletes, but should be present in the food consumed by every person. L-valine activates somatotropin. Its job is to maintain a balance between muscle mass and body fat stores.
In sports:
L-valine is especially recommended for strength and endurance sports. Valine with leucine and isoleucine form BCAAs, which in these disciplines can be an additional source of energy. It protects against catabolism and accelerates the recovery of muscles fatigued by exercise.