It’s a little tricky to get other sims climbing. If I started my climb club, I go to a random lot 5-1-1 or 5-1-2 Kyomatsu and call the members. Then i go with all members in near of the beginner wall. Now my members begin to climb automatic. The problem here is, the NPC don’t find the climbing wall because its not on the active lot, so you need to direct there in the near of a climbing wall if the wall is not on the lot. I agree there should an option as it have skiing/snowboarding or that npc can use these objects which are off from your active lot.
Another option is to use the climbing wall from fitness stuff. Normally they should use this without problems.
