Standing up no longer hurts. My body seems to be developing a muscle awareness of proper posture and balance. I now see why the VA buys Wii Fit games for rehabilitation.
My balance has improved from nonexistent to below average. I feel like an acrobat. A morbidly obese acrobat, but that'll do. Baby Huey to John Belushi.
Plus I can't tolerate unhealthy food. I now believe what The Hacker's Diet website says, exercise doesn't burn calories as much as it drives you away from eating junk. Right now I wouldn't eat a Big Mac without violence.
EDIT: added http://www.fourmilab.ch/hackdiet