What is the difference between flexibility and Mobility ?

Flexibility is defined as “the ability of a muscle or muscle groups to lengthen passively through a range of motion”, whereas mobility is the “ability of a joint to move actively through a range of motion”. ... It is not only the muscles stretching over a joint but also how far the joint moves within the joint capsule.

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Answer:

Flexibility is defined as “the ability of a muscle or muscle groups to lengthen passively through a range of motion”, whereas mobility is the “ability of a joint to move actively through a range of motion”.

Explanation:

Keyword is what exactly are you doing. If you're basically stretching your arms without adding any sort of movement, that's flexing, but if you're moving your arms around like doing any sort of thing (like reaching to a cup) then it becomes mobility.