Its not b, Muscle fatigue limit is wrong.
Functional ability is correct
Activity can help prevent heart disease and stroke by strengthening your heart muscle, lowering your blood pressure, raising your high-density lipoprotein (HDL) levels (good cholesterol) and lowering low-density lipoprotein (LDL) levels (bad cholesterol), improving blood flow. and your hearts over all function
Aerobic exercise like running, jogging, swimming and walking because all of these get your heart rate up.
