Why do people do things like "rock climbing",,etc?

I just tried indoor rock climbing for the first time today and OMG. It was super fun!!! Its definitely a challenge and sort of a puzzle. You have to figure out where ur gonna put ur feet and where your gonna try to grab onto next. I was about 10ft in the air and missed the rock I was trying to put my foot on. My body was swinging. Everybody thought I was going to wall , I thought so too but I held on and I was surprised lol. I made it to the top of two different wall obstacles. And there were some baby figure things sticking out of the wall. all lined up on top of each other about 9inches away from each. I climbed that all the way up TWICE! I was super excited to be able to get to the top 4 times on my first day. It has inspired me to lift harder and lose weight so that I can be a beast next time I go