Lighter than a bar of soap

cal improvements in racing shoes. Simply put, we know more than ever how to 'beat the wall' and to keep glyc… [+978 chars] Rapid developments in sport science in the last 20 years have run alongside the technological improvements in racing shoes. Simply put, we know more than ever how to 'beat the wall' and to keep glyc… [+978 chars] Sean Kearns BBC News