If the following, which is the most accepted and accurate way to measure body fat

If a person has a bad pain in their back, specifically lower back a bit above the hip, what should they do besides going to the doctor? what remedies could they use?

Match the limiting factor with the correct definition. 1. learning about the benefits of exercise location/access 2. problem that can be solved by choosing free activities understanding 3. living close to a park motivation 4. how you were raised money 5. how you feel about yourself and your ability to exercise family behaviors

This is one popular brand of exercise machine