I think the habit of getting in touch with nature begins as kids - playing with mud, getting enough sun, swimming/playing in ponds/lakes/rivers. That improves o

I think the habit of getting in touch with nature begins as kids - playing with mud, getting enough sun, swimming/playing in ponds/lakes/rivers. That improves our immunity to a good extent. However these are good only in natural settings and not so good in the nature-pockets in urban areas.