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.
Welcome to our live coverage of Wimbledon 2015 Ladies` singles second semi-final match between Serena Williams of United States and Maria Sharapova of Russia. The winner of the match will play Garbine Muguruza, who beat Agnieszka Radwanska 6-2, 3-6, 6-3 for her maiden Grand Slam final.