Describe a sport or form of exercise you enjoy.

The exercise I want to talk about is bouldering — indoor rock climbing on low walls without ropes — which has become a genuine obsession of mine over the past two years.
I started in the least athletic way imaginable: a colleague dragged me along after work because his usual partner had cancelled. I expected to embarrass myself, and I did — my forearms gave out in twenty minutes. But something about it got its hooks into me immediately, and I've been going twice a week ever since, to a gym near my office.
What makes bouldering special is that it's a puzzle disguised as a sport. Each route is a physical riddle: which hand goes where, when to shift your weight, whether to lunge or balance. You fail a problem twenty times, adjust one foot placement, and suddenly you flow straight up the wall. That moment is addictive.
It's also the only activity that fully clears my mind — when you're three metres up deciding your next move, it is physically impossible to think about work emails. I leave the gym with tired arms and a completely reset brain. I've made friends there, my posture has improved, and honestly it doesn't feel like exercise at all. That's the trick: I got fit by accident, while playing.