Gymnastics was hard but not a nightmare because I started so young, at age 1 3/4 and didn't quit until I turned 9.  It fit like a glove, in some ways.  I was considered advanced for my age, but I only got to things like back walkovers.  It was work, but I could do it.  Some of it was easy, I bet.  Some of it caught on to me as scary, in the end, like cartwheeling off a cliff into a foam pit or doing something more advanced off the vault/horse.