Could you pedal a bicycle for 24 straight hours? How about 12? Two months ago, Michael Secrest, who holds the transcontinental record, set two world records on the track. He averaged 23.6 miles per hour for 12 hours and 22.3 miles per hour for 24 hours. See here for details, photos, and videos. In case you’re wondering, no, I could not ride a bicycle for 12 hours, at any speed. The longest I’ve ever spent on a bike is about eight hours (counting stops).

Addendum: Here is Secrest’s next challenge, two months from now.