I've also used 200 lbs in a one handed seated dumbbell press. I understand that you teach Junior high school. During the day, you don't have time to rest and relax because the kids need the attention. So at the end of a work day when I don't train, I either relax at home or do cardio now. On the days I do train, I mentally have to forget the day and focus on what is on hand.
Some days are easier than others.
I carry shakes and food bars to school and usually have them in a coffee mug or eat between class changes, so that helps keep my body weight up and energy for training. I take a lunch because cafeteria food is horrendous. I also have the support of my girlfriend who is very understanding about my strange schedule, and that has been my rock of Gibraltar. She's an elementary teacher, so she really understands. I was big as a kid and started lifting at the age of one when I picked up the end of our couch to find my toys.