Answer:
determining your muscular strength
Explanation:
Tracking your flexibility over time as you train. There are no requirements on how flexible you need to be and there is no correlation of your length of life or muscle strength with how flexible you are.
Joints, pivots or points of rotation
Oxygen
Your cells use oxygen for energy, as a result makes carbon dioxide
B
Tendon is connective tissue, specifically connecting muscle and bone, while ligaments connect bone to bone