Thanks guys for your suggestions. I do take them to walks in the evenings to get some exercise and will probably join the gym for winter. Opening a day care could be an option, but it's a big liability. It's someone's kid in your house for the whole day and if something happens to them, it can be a big hassle.

I'm looking for something that's not too stressful on them. I will go check with some local churches to see what they have.
How about a small business? I wouldn't care for making money from that but at least that breaks even.