Wow, what a bicep/forearm workout. there is this really cool indoor climbing facility with a ton of walls about, 65-70 feet high with difficulty obviously changing.
it was my first time, and my 2 expierenced climber friends i went with couldnt believ i could make it up the 5.9 difficulty (it goes from 5.3-5.13....'climbers termonology') i just used brute arm strength to pull myself up, they were impressed haha but damn my forearms are tired!
so yall ever looking for a new version of cardio/arm exercise, try rock climbing!