Static flexibility is defines as the range of possible movement in a joint and its surrounding muscles.
Dynamic flexibility is defined as the resistance of joint during movement.
Stretching is a means by which flexibility is improved. It has often been credited with injury prevention. Although evidence to support this claim is limited, a few studies indicate stretching may aid in injury prevention. A properly developed and consistently performed program of stretching will allow relative flexibility gains. Variables contributing to individual flexibility differences are, age, gender, joint structure, muscle bulk, connective tissue structure, stretching, strength training movements not done through a full range of motion.