Components of Health-Related Physical Fitness
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Flexibility is one of the components of health-related physical fitness, and by flexibility we simply mean the ability to move your joint or a group of joints through their complete range of motion, and importantly, flexibility is very joint-specific, so the flexibility you have in your knee is virtually unrelated to the flexibility that you have in your shoulder joint, and so when we talk about flexibility, we're going to talk about flexibility at a particular joint, or when we talk about measuring flexibility at a particular joint.