Reasons for traveling include recreation,[4] holidays, rejuvenation,[5] tourism[4] or vacationing,[4] research travel,[4] the gathering of information, visiting people, volunteer travel for charity, migration to begin life somewhere else, religious pilgrimages[4] and mission trips, business travel,[4] trade,[4] commuting, obtaining health care,[4] waging or fleeing war, for the enjoyment of traveling, or other reasons. Travelers may use human-powered transport such as walking or bicycling; or vehicles, such as public transport, automobiles, trains, ferries, boats, cruise ships and airplanes.