Team GB's four-man bobsleigh team which won the bronze medal at the Winter Olympic Games in Garmisch-Partenkirchen, Germany in 1936. Pictured are Guy Dugdale, Frederick McEvoy, James Cardino and Charles Green.
James Guy leads men's 4x200m freestyle relay team to silver
The sport also makes intensive use of the body's energy supplies, with a normal-sized person swimming at a fast pace burning around 800 calories per hour. Pictured is Team GB's James Guy at the 400m Freestyle heat