All your advice is very good and I am guilty of not following all of it.
As far as what I did before I started teaching, I practiced my instrument and performed! It is still fun but I think I need to find an entirely non-band/music related hobby. I have a few but hardly have made time for them since I began my career.
I am out of shape and need to find something physical I enjoy...
I think I really need to take my work email off my phone as you have suggested. It is on my phone and has been since I started teaching. I knew older guys who would say they don't do that and not to, but I "knew better." Those are also some of the same folks that said to be careful not to get burnt out, I "knew better" than that too.
Your last suggestion is something I have began implementing and it is helping. Just hard to turn the ship around once you've truly burnt out.
What did you do for fun before you started teaching? Set aside 30 minutes to an hour a day to do that thing. For me, it was video games. I still play, but not as much as I used to.
What is something physical you enjoy? I'm not the best at following this advice, but find something physical to do. I stink at golf and archery, but I do them occasionally and it really helps. I love rowing, but where I live there's no place to do so.
What are your 'official' work hours? i.e. Mine are 7:15 - 4:15. I have the band hall open at 7:15, I throw the kids out at 4:30, and I try to be out of here by 5:30. That gives me an hour and 15 minutes to do any wrap-up I need to do. If it isn't done when I leave, the nice thing is it'll wait for me to come back the next day.
Take your (insert curse) (insert epithet) (insert yo'mama joke) work email off your phone/tablet, and DO NOT ANSWER WORK EMAILS outside of your business hours. That's a huge source of stress and it almost drove me clean out of the business.
Set limits on your work time. This job will expand to fill all the time you give it. If you give paperwork 30 minutes, it'll fill 30 minutes, but you'll be more efficient. If you don't give it a limit, 4 hours later you'll still be working paper.