The effects of the environment are manifold, but the most important among the external factors are diet and exercise. Substances and elements that make up the bones must be ingested with food in sufficient ,development of the musculoskeletal system affect physical activity. At low motor activity of bone become thinner, weaker and longer. Their form varies depending on the kinds of physical activity. At an early age playing a musical instrument has delayed the process of ossification of the phalanges, which causes them to lengthen. Prolonged standing, transferring large weights, wearing tight shoes foot flattens and develops flat.