A football player must be a man not easily exhausted or injured. A game is not a severe strain on a man who is physically fit, because proper training has put him into such condition that he can speedily regain the loss caused by the tax on his strength. Taking out time for exhaustion or injury is giving the other side just as much rest and may be just what the opponents need. Other things being equal, the team with the endurance will wear down the opponents, and many a championship has been decided in the last few minutes of the game.