Which heart rate is the level at which your heart and lungs receive the most benefit from a workout and should be maintained for 20 to 30 minutes?

im 100% sure its all of the above.

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.