I'm not an "exerciser" either but I suggest signing up for a weekly class. If you pay for it, and it's a regularly scheduled event, you will be more likely to go. At least that's how it works for me. I go to yoga once a week (through our community center).
I didn't realize that you do child care in your home. Seven boys at once! God bless you! I know I couldn't deal with more children than I already have, so I admire you.