10/1 My dad is now using a walker to get around; they sent some pictures. I went on my first run yesterday after six weeks, and my right hip joint is aching from it. I know what it is, I’ve seen it on X-ray, it’s a slight deviation of the ball of the joint from a proper sphere. I do not know whether the pain would go away with more regular training. I also do not know what kind of pain it is that makes my father need a walker. It took several decades of my life until I realized that old people are not moving so slowly because of a general, mysterious slowness that has befallen them, but to avoid pain.