Currently trying to alternate running with an exercise bike while sitting. 8 or so minutes easy followed by a minute or two hard for each. Plus at least once a week on the elliptical with a 60 pound pack. This keeps my back good. I think Lendl had the right idea with the biking. If you sit it gets that ROM that aerobic running misses. But Lendl hurt his back. Thus the 60 pound pack. I'm finally able to sleep on my stomach lately. It's been such a long road back. So many years. Strange that a back can continue to "heal" 10 years after the injury. But not actual healing. Just a matter of strengthening to keep everything in place.

But only getting to do aerobic stuff maybe 3 days a week. Plus tennis once or twice.