Learning to surf
It had rained all night, so the start of the surfing lesson was pushed back a half hour due to the weather. When we got there we were loaned a rash guard (long sleeved t-shirt) given a lot of instructions on safely and then split into small groups, each with an instructor and taken out into the surf.
A small part of me was expecting to succeed on the first go as I snowboard frequently. A large splash later and I reset my ambitions.
I stood on the fourth attempt.
I rode a wave to the beach on the sixth.
I was very happy with that, but after 2 hours, I was exhausted.