I took up running again, primarily to become fitter. There's muscular adaptation. There's cardio vascular adaptation. I don't know how much skeletal / ligament

I took up running again, primarily to become fitter. There's muscular adaptation. There's cardio vascular adaptation. I don't know how much skeletal / ligament adaptation there is, especially at my age. I recently purchased a nice pair of running shoes after doing some research - fortunately, they were on sale and not much more expensive than my relatively entry level pair that I needed to replace. There was zero breaking in - they fit perfectly, felt amazing right away. They cushion better. My running distance hasn't gone up, but I'm recovering faster and able to run more often. Running on pavement isn't kind to the body. If shoes can help reduce injury, then some people will use that to push harder while others will be glad that they're getting fit without getting hurt.