Nude? :) I do think getting a bit of sun everywhere has to enhance the benefits. Thus my solution.

I also walk a lot when I can and weather allows. I started walking with a weighted vest occasionally and it was like my body went into some kind of good shock. I was surprised how little soreness or fatigue I felt even the first time, after a two hour walk wearing 20 lbs. And the physical energy boost was dramatic. I switched to 40 lbs the second time and since.

This isn't super useful for UV exposure in winter, due to low angle of the sun, clouds, and of course clothing.

I just take vitamins if needed, saves time and no cancer.