Soccer science

Computers that monitor the fitness of players, video replays for close decision in cricket, and statistics at your fingers tips for every shot played in the Wimbledon final. Whether we like it or not, modern technology plays its part in sport in the 21st century. Now an English company has produced a system that allows coaches to monitor every move of their players on the football field. The BBC's Peter Stevenson has been to Premiership side Derby County to see exactly how the system works.