A person's anaerobic threshold has been reached when their body is under extreme conditions and the burning of oxygen can not keep up with the body's demands.
Novak Djokovic captured his second straight Wimbledon title and the third of his career by defeating Roger Federer 7-6, 6-7, 6-4, 6-3 in Sunday's men's final at the All England Club. Djokovic is the first man to repeat as Wimbledon champion since Federer won five in a row between 2003 and 2007.
Andy Murray beat Vasek Pospisil 6-4, 7-5, 6-4 to set up a Wimbledon semi-final with Roger Federer on Friday. Federer had earlier continued his excellent run of form with a 6-3, 7-5, 6-2 win over Gilles Simon. Watched by the Duke and Duchess of Cambridge, and David Beckham, Murray made his sixth SW19 semi-final.