What is the proper term for the exercise that increases the range of motion around joints?

The appropriate term for the exercise that increases the range of motion around joints is flexibility training. Flexibility training focuses on stretching the muscles and the connective tissues around joints, thereby enhancing their ability to move through a greater range of motion. This type of training often includes various stretching techniques that can improve overall flexibility, reduce the risk of injury, and enhance athletic performance.

Endurance training primarily aims to improve cardiovascular and muscular endurance rather than joint flexibility. Strength training focuses on building muscle mass and strength and does not specifically target the range of motion around joints. Resistance training involves exercises that use resistance to build strength, which can also improve muscular endurance but does not explicitly aim to enhance flexibility. Thus, flexibility training is the most precise term that describes exercises aimed at increasing joint mobility.