My feet today were very sore from the interval sprints yesterday--even though I was running on a beautiful track, even though I was wearing excellent Mizuno shoes.
Plantar Fasciitis is such an annoyingly mundane physical limit, and it's one that has only hit me in the past two or three years. But it's real. I do stretches for it, and I wear a splint sometimes at night for my left foot, to keep the fascia from contracting. A friend at work said I should stretch out my calves--which I thought I was doing. I do have tight calves.
I sometimes wish I had started martial arts in earnest in my 20s. I wouldn't have had the speed and strength to become some great champion, but it would be cool to see how much more I could have achieved starting at, say, 24 instead of 44.
However, there are a lot of middle-aged limits that I am getting past. I took a deck of cards to the gym today and did my new sensei's push-up routine--turn over a card, do that many push-ups. One of the trainers at the gym pointed out that when I was getting tired, I was lowering my head, instead of keeping it in a perfect line with the rest of my body, which was limiting my effectiveness (and making injury more likely). Tuck my chin back to keep the head in line, he said. It was a great tip. I ended up doing 177 push-ups, and that's way more than I once thought I could achieve as a middle-aged martial artist.