I'm scared of heights, and yet for some reason this was not my first time wall climbing. I wanted to try it again, because despite the heights it's fun, and as I can tell by my sore arms and legs incredibly good for my body. Specifically I chose bouldering. It requires no knowledge of ropes and the shoes are rent-able in Lisbon. One tip would be to go with friends. The climbs require breaks in between and if they're more experienced it's a good chance to really work on your technique.
