What term describes the ability of a joint to move freely in every direction, through a full range of motion?

Flexibility

Flexibility is the ability of a joint to move freely in every direction, through a full range of motion.

Explanation:

Flexibility refers to the ability to effectively move joints through a complete range of motion. It is the ability or capability of an individual to move, bend and stretch in a full range of motion. Athletic performance can be increased through flexibility and the risk of muscular strain and injury can also be reduced. Factors that influence flexibility include: gender, age, fitness level, muscle elasticity and so on. An example of flexibility exercise is stretching.