Back hasn't hurt at all the last few weeks. It used to wake me up at 2 to 4 AM from pain. Hasn't done that in a year or two. But more recently sometimes it would hurt when running (the slight twisting motion) but that was related to trying to pull something towards me with one hand. (Disney spin ride, one arm rows). But still it would often just be very stiff. Like after driving to work, couldn't straighten out very well when first standing.

Last few weeks not even any stiffness. Best it has been in years. Not sure why. We do have this new mattress, but we've had it for maybe close to 6 months...? It seems to mostly coincide with doing longer running intervals (5/4's) but that doesn't really make sense to me.... Only other thing I can think of is that I've been doing some shadow boxing.

So last night slept in the guest room on standard mattress. Back felt fine. Don't want to take this for granted.