Mountaineering is an almost unique sport as the climber is in competition with nature itself rather than with other humans. For this reason it is an extremely dangerous activity. Nature does not follow any rules or 1, and can often play very 2. Professional mountaineers are quite aware of the risks involved in their sport. Although they are 3 spirits at heart, they have a full understanding of the vital safety measures 4 to keep them alive, and never knowingly put themselves in needless danger. On the other hand, they say that the sense of 5 at the end of the climb is directly proportional to the risks involved.