What's the ability of a joint and a muscle group to move through a full range of motion is referred to a muscular endurance

Flexibility is the ability of a joint or muscle group to move through a full range of motion. There are many ways to improve flexibility, including yoga and Tai Chi. While flexibility can be improved, different muscle groups have different levels of flexibility, known as a range of motion. Some areas of the body can feel tight and be difficult to make more flexible, while others are much easier to lengthen and loosen through stretching and exercise.

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