This earlier analysis might give us a greater understanding of the physiological responses in the environment and could additionally be used to arrange for out of doors activities. However, the physiological responses in a work-related surroundings might be totally different in the outside, and thus suggestions could need to be adapted for out of doors recreational activities. For this cause, the current chapter will embody both work-related and outdoor-related physiological responses and tips. Human physiology responses acclimate to altitude exposure from a couple of days to weeks. These physiological changes ought to, theoretically, enhance O2 transport to the active muscle tissue during train, and it is why athlete use altitude coaching acclimatization to enhance their efficiency .