Marine Corps Physical Fitness Test. Fitness is essential to the day-to-day effectiveness and combat readiness of the Marine Corps. The Marine Corps considers physical fitness an indispensable aspect of leadership.
A: Chemical energy is for producing heat in the human body to sustain vital functions, converting solar energy in plants through photosynthesis, producing electrical energy in batteries to power devices and burning fossil fuels in combustion engines to produce heat or motion.
Since calories are simply a measurement of energy, this question could be re-worded to ask, How does the body use energy?. Obviously, the body uses energy to perform all of its functions. If we consume more energy (calories) that our bodies need, the excess is stored as fat.