Kelly Smith has held his breath for more than seven minutes and descended to 131 feet without a tank. He won the Silver Medal in the Marathon at the Sydney Paralympics and worked as an air traffic controller after getting paralyzed in a rock climbing accident; flew commercial planes, worked as a flight instructor, and was on the Canadian Speed Skiing Team before. Now, he solves the chess match of riding single track on an e-assist mountain mountain bike without the luxury of putting a foot down.