b'Above: The Times exclusive pictures of Team GB heptathlete Jessica Ennis at the Institute of Sport in Sheffield, where her coach Toni Minichiello explained to me the technical details shown in this strobe-effect picture of her working at full pace over the hurdles, 23rd April 2010Opposite: Several competitors show the determination required during the Womens Pole Vault competition at the Olympic Stadium, 2012 Summer Olympics, London 6th August 2012.74'