From a Wall Street Journal online article:
Now 63, Mr. Peterson has progressed from bike paths to rugged mountain trails and is known for his caped helmet emblazoned with his nickname, UniGeezer. Based on his GPS and bike computer, he estimates he’s logged nearly 30,000 miles, or 24 million pedal revolutions, since he started.
He thinks there’s a fear factor that prevents more people from trying unicycling. “If you fall, 99% of the time you land on your feet,” Mr. Peterson says. His worst injury was a torn piriformis, a tiny muscle behind the glutes, from overuse.
Unicycling isn’t as trendy as spin class, but Terry Peterson says he sweats just as much and smiles way more.
In 2006, at age 50, Mr. Peterson was 30 pounds overweight and got winded climbing a flight of stairs. His job as a piano tuner in Lomita, Calif., was mostly sedentary.
Popular workouts like running, cycling and boot camp sounded boring. “I needed something that would constantly demand my attention and keep me entertained,” he says. He thought back to his childhood unicycle, googled his old toy and was wowed by online videos of Canadian off-road unicycling pioneer Kris Holm. “This wasn’t the cheap ride I had when I was 11,” he says. “He was on a real, purpose-built unicycle doing unreal tricks.”