The answer to this question is Ballistic Stretching.
Ballistic stretching refers to the type of stretching that force you to perform a various bouncing movement that push your body way beyond its usual range of motion. This stretch is considered dangerous because it could cause the performer to tore a joint that will affect your overall movements and limit your physical capabilities
They answer is decreased muscle tension.
The digestive system breaks down (catabolizes) food into its nutrient parts. The circulatory system brings those nutrients to the cells where they are needed. One of the main requirements of the cells is for energy, which the body manufactures by combing nutrients (especially carbohydrates, glucose, glycogen, and glycogon) with oxygen. The body takes in oxygen via the respiratory system and distributes it via the circulatory system.
Hope this helped :)
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