Flexibility refers to the ability to move joints through their entire range of motion, from a flexed to an extended position. The flexibility of a joint depends on many factors including the length and suppleness of the muscles and ligaments and the shape of the bones and cartilage that form the joint. Flexibility can be genetic, but it can also be developed by stretching.

Flexibility is an important component of fitness. Exercising tends to increase the amount of flexibility in a joint. Flexibility is also specific to the type of movement needed for a sport so it is more important for some sports than others. Cyclists, for example, require less hip flexibility than hurdlers, and swimmers need more shoulder flexibility than runners. 

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