One that does not exhaust you allows you to walk all day without extreme fatigue. A common beginner mistake is to walk too quickly and make frequent rest stops. Follow a rate of activity that does not require you to rest every fifteen minutes or half an hour. Learn the rest step for climbing: Advance your foot, and after placing it on the hill, before bearing weight on it, rest briefly. Then shift your weight and repeat. Synchronize your breathing with your climbing. Whether you’re low down on steep ascents or higher, inhale on one step and exhale on the next. At extreme altitudes, take two or three breaths with every step at a rhythm that you can continue without stopping to rest. Repeat a verse of a song or a mantra in synchrony with your feet and lungs. Vary the pace depending on the trail and conditions of the climb. Speed up on easier sections, slow down on more strenuous. Begin the day’s journey slowly, and as the muscles and cardiovascular system have “stretched”, increase the pace. Toward the end of the day, slow down as the machine is more fatigued. The other less common mistake people make is to walk too slowly, which is fatiguing in itself. Walk at your pace and not that of the person in front of you. A certain level of discomfort in exercising at altitude (and at sea level) must be tolerated.