to climb to the top of something to scale a mountain guide from the Himalaya mountains a Sherpa the height of a place above sea level altitude not breathing easily breathless a climb up a mountain or other object an ascent the ability to do something difficult for a long time endurance two organs in the body that process liquid waste kidneys a long, hard walk a hike https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf