Andy Baldwin courtesy Catalyst
For those who think running a marathon isn't challenging enough, there's the Ironman Triathlon. Held Oct. 13 in Kona, Hawaii, the ├╝ber-endurance world championship airs Saturday on NBC (Dec. 1, 4:30 pm/ET).

In addition to elite athletes, the race also features everyday folks - and reality stars. Andy Baldwin, best known as the ( still single) star of last spring's The Bachelor: An Officer and a Gentleman, was one of the 1,700 racers. I'm guessing that competing in the 2.4-mile swim, 112-mile bike ride and 26.2-mile run was less painful than deflecting the desperate advances of the Bachelor's pack of harpies.