Craig Alexander, of Boulder, Colo., right, collapses along side Chris Lieto, of Danville, Calif., left, at the finish line of the Ironman 70.3 Boise Saturday in Boise. Alexander came from behind to edge out Lieto at the finish line to win the race. (AP Photo/Idaho Press-Tribune, Greg Kreller)

Question: What is the most strenuous thing you've ever done -- work or recreation wise?