t will be fascinating to see how long he can ‘maintain the rage’,” says Penfold, “what you also find is that players develop a fitness capacity over each season, so that the effort required to get through a season becomes less and less as they become accustomed to the physical demands needed and their body develops both an adaptation and resilience to these stresses. “As his body stops being able to recover as well, is he able to modify how often he plays at that intensity – either within a game, or also which games he goes hard. Photograph: Daily Mail/REX/ShutterstockFootballUS pro soccer's 50th anniversary: 'They called us com. US pro soccer's 50th anniversary: 'They called us communists and midgets' | Football | The Guardian.