Mountaineering
Mountain climbers use the strength of their arms and legs to climb up mountains.  Many mountain climbers use ropes and wear special shoes and safety equipment . Most mountain climbers go up mountains as a hobby or as a recreational activity.  A few do mountain climbing as an occupation or job.  They get paid by outdoor clothing companies or universities to climb up mountains, or they are hired as a guide by recreational mountain climbers.  Some are scientists who study mountains.