Recently I joined my sister in law for a night of rock climbing. I have gone several times before. In fact our old youth room in our church had rock climbing walls. My observation was that middle school students were always way more eager to climb than high schoolers. I think the idea of looking stupid in front of their friends was a factor.
Our local gym also has a rock wall. I only go on it every once in a while when my kids REALLY beg me. Why? Because it's located at the front of the gym as you walk in and if you get to the top the you are at eye level with the people upstairs on the cardio machines. It's a little awkward.
I also don't want to look stupid. It's mostly kids who try and the adults always look funny as they struggle to climb and accomplish what their kids do with ease.
We had the perfect storm when we went to climb. Free Ladies Night. Less intimidation and the support of female friends. We put on our special shoes, got a training on how to belay and we were on our way.