AM - Stacy dropped me off at the gym, and I did 30 minutes on the elliptical. It felt okay; a bit of tightness but not much pain. I will see how my body reacts, and if I'm feeling good I'll do another session during the noon hour. The walk home felt fine, probably because the muscle was warmed up.
noon - my body seemed to be agreeing with the morning workout, so I went back to the gym during the noon hour and did another 30 minutes on the elliptical. Everything felt a little bit looser the second time around (to be expected). This time, I did 15 minutes easy, and then the last 15 minutes at the elliptical version of "marathon pace."
After the gym, I went to see my chiropractor. As Josse suggested, my sacrum was very much torqued and twisted. The DC thought that was causing a bit of tendinitis in a hamstring muscle where it attaches at the ischium. Being a chiro, he thought the whole problem was 100% mechanical in nature. If that is correct, then the solution should be purely mechanical as well, and a good adjustment should fix everything. I'll know more tomorrow, but my body moved like butter during the adjustment, and immediately afterward everything felt much better, especially at that muscle insertion point. I'm walking pretty good right now. I jogged across my office a little bit later in street shoes, and didn't feel any pain, also good. Obviously, the muscles themselves still have some residual inflammation and tightness, but perhaps the root of the problem has been fixed? I guess I'll have to wait and see how I feel tomorrow morning. It can be kind of deceiving, since I tend to feel better over the course of a day anyway from my muscles getting warm. So I may be having trouble filtering the effects of the adjustment from my normal daily pattern.
In any case, today has been good on all counts. Running might be an option tomorrow. I'll see the chiro again Wednesday.