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When you workout, your cells need energy for muscle contraction. In order to get this, your body will carry out a process called cellular respiration. During this process, glucose (taken from food) is broken down in the presence of oxygen to make usable form of energy cells, called ATP. This process converts chemical energy from the bonds of food molecules into energy that is stored (potential energy) in ATP molecules. The process also releases heat (thermal energy), which is why you feel warm. Your body carries out this amazing process to fuel your workouts!