Unrelated but, to date, rock climbing (indoor and outdoor) is still fat-free. I'd guess skateboarding and BMX and stuff like that, if it's still around. Mountaineering? I go to barre classes that are almost never infiltrated by fats, mostly because we use shitlord props like this rubber band that goes around your thighs. I can't believe fats have coopted ultra marathoning and the Ironman though.