Edited sentence: Hence, shifts typically last from fifteen to sixty seconds in a competitive game.Ice hockey is a physically demanding sport, due to the high tempo and quick changes in puck possession during a typical game.On a full-sized rink, a player who merely coasts or who is relatively stationary will be of practically no use to his or her team.Taking up ice hockey before becoming comfortable on skates, and having a modest level of fitness, is a good way to suffer injuries or otherwise become discouraged