The Tibetan people are an ethnic group native to Tibet that live throughout the Tibetan Plateau. They live at altitudes up to 15,000 ft, and are thus of extreme interest to researchers investigating HVR in high altitude populations. One of these populations are the Sherpa people, a group of Tibetans who are sought after for their knowledge of and skill with navigating through the Himalayas. Historically, Sherpas have been contracted to guide expeditions up Mount Everest, but the practice has since declined in light of exploitation of the Sherpa guides. The energy and ease at which the Sherpa ascend and descend mountains is due to their ability to use oxygen more efficiently. This ability to excel at mountaineering has shifted their culture around it. Tourism has become a driving force for the financial income of the Sherpa people. The Sherpa are able to make much more money acting as travel guides due to their local knowledge, and climbing ability.