When you start exercising the body metabolism level increases to provide the required energy. The more intense the exercise bout, the more energy required. The body produces energy by producing Adenosine triphosphate (ATP). To produce ATP, the body breaks down glucose with the presence of oxygen (aerobic respiration) that is provided by the red blood cells within the circulation system. Hence, regular oxygenation of the muscles is crucial to ensure the muscles are maintained and conditioned well.

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If the circulation system is unable to cope with the increased demand for oxygen the muscles go into anaerobic respiration, where glucose is broken down into ATP and lactic acid. When this lactic acid enters the blood stream, performance is affected by the occurrence of temporary cramps which brings about acute pain. Further, this slows down the recovery period needed for the muscles to develop.

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Additionally, during a work out session, micro-tears can appear in the muscles. The short-term effects of this can be uncomfortable, unhappy limbs and swollen, inflamed muscles.

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Thus, good circulation allows more oxygen to flow to the muscles during exercise, preventing fatigue from setting in and improving the efficiency of the workout. Adequate circulation also helps repair the micro muscle tears that occur by providing the required nutrients and thus speeding up the recovery time.