The Knee is a Tell-Tale Indicator

   The knees might be an indicator of how the whole body is doing. And, a person walking loose and easy and painless might generally live longer than those whose legs and knees are tight.
   Here's maybe one reason why: Wear-and-tear, and pounding, and stress (and maybe toxins) are the things that bring aging, as much as anything else. You can see that pounding in the knee (and hip) quicker than in other parts of the body. It is more evident, because the knee takes more wear-and-tear than other parts of the body.
  This theory assumes that at least a good portion of the wear-and-tear affects the whole body. When you run, the knee is affected the most, but the other portions of the body also take wear-and-tear from the same run.
   Is running then bad for you? Does it shorten the years of your life? I hate reading this. I found it at

https://www.huffpost.com › running-too-much-health-study_n_5079707.

  "A number of earlier studies have suggested that people who run more than 20 miles a week or an an average pace of 7.5 miles or faster are more likely to have shorter lifespans than those who run slower over shorter distances."
   But, I take hope for what is reported at the end of the article.
   "The Centers for Disease Control and Prevention recommends that adults engage in at least 75 minutes of vigorous activity (like running or jogging) or 150 minutes of moderate activity (like brisk walking) every week.
  Note added 9/8/19: Perhaps it would be more accurate to say the legs are a tell-tale indicator, not just the knees and hips. Or perhaps just say the ability to walk is the indicator. Look at the elderly, and see how many of them become hobbled. I don't even need to point it out, as we all notice as much.
   Not every thing that goes on in the heart is related to the leg, nor does every affliction of the leg reflect what is going on in the rest of the body. Still, there is enough in common that you can look to the legs as a pretty good indicator of the deterioration of the body.
   It could be noted that the ability to communicate is as also a key indicator.
   And, someone will suggest that it is obvious the ability to walk and ability to talk are indicators of age, so why even blog about it?