I actually qualified as a Swimming Teacher and Lifeguard - part time while I was doing my A levels.
Now I'm a chartered Civil Engineer, looking after environmental infrastructure in South and Eastern Europe. (i.e. water supply, waste water disposal and treatment, waste disposal and management), so lots to do there. That pays the bills.
And for the last 10 years I've been running my own translation office, doing mostly technical stuff that other translators don't touch. That pays for my holidays.
And I still teach kids to swim at the local swimming club.