Human-powered transport is the transport of person(s) and/or goods using human muscle power. Unlike animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming. Modern technology has allowed machines to enhance human-power. Although motorization has increased speed and load capacity, many forms of human-powered transport remain popular for reasons of cost, convenience, leisure, physical exercise, and environmentalism. Human-powered transport is sometimes the only type available, especially in underdeveloped or inaccessible regions. Modes Non-vehicular Crawling (human) Walking (233 watts at 3 mph)Walking bus Running (1,150 watts at 10 mph) Sprinting (1,690 watts at 15 mph) Swimming Climbing and mountaineering Ice skating, roller skating, and inline skating Cross-country skiingHuman-powered vehicles (HPVs) ...