Brainliest to first reasonable answer. : )

Muscles move the body by contracting against the skeleton. When muscles contract, they get shorter. By contracting, muscles pull on bones and allow the body to move. For example, the biceps and triceps muscles work together to allow you to bend and straighten your elbow.

Explanation:

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

what subject is this