Lance Armstrong, a six-time winner of the Tour de France bicycle race who next month will try for his seventh straight victory, can cover 32 miles in one hour of riding. In contrast, the average cyclist covers 16 miles; a top marathon runner can cover 21 miles on a bike.
Armstrong can ride up the mountains in France generating about 500 watts of power for 20 minutes, something a typical 25-year-old could do for only 30 seconds. A professional hockey player might last three minutes – and then throw up.
So how does he do it?