Cardiorespiratory fitness is a measure of how well your body is able to transport oxygen to your muscles during prolonged exercise, and also of how well your muscles are able to absorb and use the oxygen, once it has been delivered, to generate adenosine triphosphate (ATP<span>) energy via cellular respiration (cellular respiration is a chemical process in your body's cells that converts the energy stored in the food you eat into the </span>ATP<span> form of energy that is recruited for use by your muscles). Essentially, your cardiorespiratory fitness level is a measure of the strength of your aerobic energy system. If you haven't already read the </span>Exercise Energy Systems<span> article you can do so to get a better understanding of what </span>ATP<span> is, what cellular respiration is, and what the aerobic energy system is (in addition to your body's other two energy systems).</span>
Explanation: Mental life has a lot to do with how psychologists focus more on the physiological research in the 1920s and 1960s, but as times goes by, they emphasize more on observable behavior. Because both mental life and observable behavior work together for a good psychological result.
The answer should be Both A and C Reading clears the mind making it ready for sleep and post-exercise drops the body temperature making it want to sleep
