Whether he's racing up a rope, leaping from limb to limb or skillfully swinging a saw, Mark Chisholm has spent his life in trees. We talk the secret to competitive tree climbing, life as an arborist and the best trees in the world. Then, it's a special sporty Top 5.
Mark Chisholm: 2:00
John Shull: 26:15
Top 5 Obscure Sports: 34:19
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