I had my first surf lesson with my friend yesterday. It was so exhausting, and at the end of 30 gruelling minutes I managed to kneel on my surfboard briefly. No wonder you don't see fat surfers, it must burn a million calories an hour.
Today the deltoids in my left arm are so sore I can barely move it! So, much as I'm looking forward to having another go, I'll have to leave it a couple of days.