My little daughter is rotating between the bars and the ropes at the gym. Mostly she uses the rope as a swing. I've seen her climb most of the way up, but never yet to the top. A year ago her big sister could make it to the top easily, but her pre-teen growth spurt made it a lot harder since then. I've been trying to be a model of showing them the utility of doing pull-ups daily, but they're way more motivated by peers than by Dad.