I used to do free-climbing. The first time that I climbed with ropes was with friends. It was also their first time with ropes. They didn't know how to tie a knot. The first time I repelled off a cliff was with a gold line with partner feeding from below. The knot slipped. I felt a vibration and hands instinctively grasped. I was 4 stories up and hanging on literally at the end of my rope. I was 22.
I started to look at my body as a resource. Climbing helped to fine tune a sense of balance. Kept the mind sharp. Then read that Chris Langton (an A-Life pioneer) had a hang gliding accident. Started to make risk-reward assessments. Changed sports.