I spent a few weeks doing a long hike.. and found, to my surprise, my arms and back were much more flexible and some difficulty I had with stretching my left arm had completely gone. I think that just the movement of my arms while walking each day had been very beneficial.

For some years now, I've thought about trying to do some kind of diagram that illustrates how your hands, feet, ears and nose get shorted when you have poor circulation. I don't know how to illustrate it.

If you have a "cup half full," it's the same areas that consistently get less oxygen, fewer nutrients, etc. Over time, that takes a very big toll.

I used to read medical records as part of my job. Diabetes, which is a blood issue, significantly impacts the feet. After many years of poor blood sugar control, feet issues become so serious that diabetics can end up needing to have a foot amputated.

I don't think it matters that much how much you move your arms per se. If you do aerobic exercise to strengthen your circulatory system, it eventually impacts the feet and hands significantly.

I was born with a serious medical condition that negatively impacts my circulation. After getting diagnosed, I began redressing a backlog of lifelong issues.

As circulation to my hands improved, I had pus appear under my cuticles. I spent weeks or months waking up with very painfully sensitive fingertips. My hands began to slough dead skin.

This stuff went on for a long time. I wasn't exercising my hands particularly. I was just improving my baseline health, including my circulation.

N=1 (sort of -- my son with the same condition also had a lot of hand drama as we got healthier)