Young people represent one of triathlon's fastest-growing demographics, according to USA Triathlon with most of the action  at the grassroots level, as local recreation departments, health clubs, sports performance-training facilities, and private organizations  host triathlons for kids (often sanctioned by USAT) or partner with host groups to offer triathlon clinics and camps. 

"Swimming, riding a bike and running around are quite common activities for young kids," says Steve Kelley, athlete development director for USAT. "So putting the three together into a single sport is not strange to them and can be quite fun — particularly if the competition isn't overemphasize and focus is on the satisfaction that comes with finishing a triathlon."