Barton Triathlon Share definition Flag A Triathlon consisting of a 1.5 mile run on a treadmill, 5 miles on a stationary bike and then a shower. The fatty started his training routine with a Barton Triathlon. Barton Triathlon by nakedchoker May 12, 2011 0 0 Get merch Get the Barton Triathlon mug. Buy Now — $32.95 See more merch