Yes, as a matter of fact I do. I like how you think!
However, I try to use the gym for my workouts. In fact, my resolution for this year is to get back to exercising faithfully like I did before I injured my neck this past summer. To tell you the whole truth, I suspect a significant part of my problem is that I'm feeling fat and lazy since I couldn't exercise at all and I gained back a bunch of the weight I had lost last year.
My head doesn't feel as clear, I experience insomnia and weird sleep patterns (it's nearly 3 a.m. as I type this...), and I feel sluggish all the time. I think I have a little bit of Seasonal Affective Disorder. Exercise does a lot to take care of all those things.
For a number of reasons, the 2 hours of babysitting at the gym doesn't work well for writing time, I'm afraid. I've tried. But it *IS* key to my sanity to get over there to exercise. And that *DOES* count as alone time for me, so if I get back to the gym more often, I could use my time at home for more than mental health.
With all that said...Incog, I really hope this thread isn't turning you off of home schooling! That would make me sad because it is a very workable option. I suspect that for any NORMAL person, the amount of alone time I get would be more than enough. It's just my own quirk.
Plus most people aren't goofy enough to try to write a novel while home schooling with kids as young as mine. Just me! Take the book out of the equation, and I'm sure I'm no more overburdened than any other mom!