Jamaican super-sprinter Usain Bolt has accepted a challenge from British long-distance champ Mo Farah for a charity race later this summer at a distance somewhere in between the two runner's strengths.
Who would win? Science tells us that it depends on each runner's training and their strategy.
Bolt won gold at 100 meters and 200 meters at the London 2012 Olympics. Farah notched a double gold in the 5,000 meters and 10,000 meters before his home crowd last summer.
"It would be a fascinating, great race," said Roderick King, professor of sport and exercise biochemistry at Leeds Metropolitan University in England. "The two individuals are very different in biochemistry as result of their genotype and their training."
The 28-year-old Somali-born Farah has the body of a typical long-distance runner: thin (128 pounds), wiry (5-foot, 9-inches), and a lot of slow-twitch muscle that are adapted to endurance events. Bolt, 26, is massive in comparison: his six-foot-five inch frame carries 207 pounds across the track with fast-twitch, strength-producing muscles, according to King.