Why is it that the fastest growing segment of triathletes is people over 40? The New York Times looks at the phenomenon and comes up with a surprising answer: training for a three-sport event is actually easier on your body (because it puts less strain on muscles and joints) than training for a longer single-sport event. Also, the Times also points out, the kind of cross training required of triathletes is perhaps a bit less boring than training for single-sport contest. The Times thoughtfully includes a couple of helpful links, like this one for first-time triathletes, and this one for training programs and camps, as well as an invitation to readers to discuss the over-40 phenomenon.