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.
Do that daily for about four weeks, come rain or shine, whilst enjoying your summer vacation.
Of course that probably doesn't work for every country, but here in Finland it's normal enough. Too bad I'm a pale-skinned redhead, covered in freckles, and I get burned if I'm not too careful.
Why? This is not how we naturally insolate.
I’m not saying you’re wrong. Just that the status quo is different parts of your body getting sun each day. You’re not replicating that, which places the burden of evidence on you.
There isn’t any burden for me to carry here.
Nor am I concerned by your apostate heretical state of disbelief. The persecution only confirms the holiness of my cause.
Disclaimer: My opinions are simply my own, and do not, in any way, reflect the views of my past or future selves, beyond a five minute interval.