Before revision: 300px|Players of Legends Football League do a warm-up exercise, USA 'Warming up' is a part of stretching and preparation for physical exertion or a performance by exercising or practicing gently beforehand, usually undertaken before a performance or practice.
After revision: 300px|Players of Legends Football League do a warm-up exercise, US 'Warming up' is a part of stretching and preparation for physical exertion or a performance by exercising or practicing gently beforehand, usually undertaken before a performance or practice.