青少年参加足球运动，能使肌肉纤维变粗，肌肉收缩力增强，足球不光是一项全

Young people participating in football can thicken muscle fibers and increase muscle contractility. Football is not only a systemic physical activity, but also promotes bone growth, bone density increases, bone diameter increases, and bone weight increases.

Teenagers participate in football, can make muscle fibers thicken, muscle contraction increased, football is not only a systemic physical activity, but also promote bone growth, bone density increased, bone diameter thickened, bone weight increased.

Football is not only a whole body sports activity, but also promotes bone growth, bone density, bone diameter and bone weight.<br>