As a teacher you are more or less obliged to pay the same amount of attention to everything. That can wear you down.
It was never physically dangerous except when I nearly fell off a horse, but it was physically arduous - especially when you were working late at night.
My mom, she is the most unbelievable mom that you could ever have in your entire life and she's always with me on everything. The most I've ever been away from her is two days. I love her more than anybody could ever know.