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Introduction There is an upper limit to the oxygen consumed during exercise requiring maximal effort. The upper limit is defined as maximal oxygen uptake (VO2max). “The maximum rate at which an individual can take up and utilize oxygen while breathing air at sea level.” Astrand & Rodahl, 1986). This can be backed up by an experiment performed by McArdle, Katch and Katch (1996). Maximal oxygen uptake (VO2max) is reached while running up hills of increasing gradient. VO2max occurs in which a further increase in exercise intensity is not accompanied by an additional increase in oxygen uptake. “The VO2max value quantitatively expresses a person’s capacity for aerobic resynthesis of ATP. As such, it is an important factor in determining one’s ability to sustain high intensity exercise for longer than 4 or 5 minutes.” McArdle et al (1996). Results Table 1 Exercise Intensity Respiratory Rate Tidal Volume Oxygen Uptake Rest (100) 12.7 478 250 125 12.9 577 315 150 13.1 670 375 175 13.3 760 436 The table shows the increases of respiratory rate, tidal volume, and oxygen uptake for each exercise intens