A triathlon is an endurance multisport race consisting of swimming, cycling, and running over various distances. The sequence of events is almost always Swim, Bike and Run; for safety reasons. Since swim is the riskiest, it is best if it is finished off first. And between biking and running, the risk of injury is higher in biking, hence the remainder of the sequence. Triathletes compete for fastest overall completion time, racing each segment sequentially with the time transitioning between the disciplines included.