Sweating is going to happen. Exercise hard, take a cool down lap and a cool to cold shower.
Not helpful.
Sunshine is (and I'm saying this as someone who spent over a decade in the Goth scene, and still is into the music) absolutely critical. It does wonderful things for your body's chemistry.
You don't have to believe me, I guess, if you think I'm lying about what things are and are not horrible for me, but if you're going to disbelieve me, maybe don't give me advice?
It's not a question of belief, it's an issue of presentation.
Here is what you wrote: "Sunshine is horrible (and other environmental issues)." That is not saying "I have medical issues", it's saying (wrist to forehead) I don't LIKE going out in the SUN!
There are lots of things in life that just flat out suck. There is no way to make worthwhile gains without struggle, effort and dealing with stuff you don't like.
To put my earlier statement a completely different way, you have a choice. On one side is exercise and sweat, on the other si...
An exercise:
Name something that you do not do but should/wish you did/are told you ought, or that you do less than is normally recommended. (For instance, "exercise" or "eat vegetables".)
Make an exhaustive list of your sufficient conditions for avoiding this thing. (If you suspect that your list may be non-exhaustive, mention that in your comment.)
Precommit that: If someone comes up with a way to do the thing which doesn't have any of your listed problems, you will at least try it. It counts if you come up with this response yourself upon making your list.
(Based on: Is That Your True Rejection?)
Edit to add: Kindly stick to the spirit of the exercise; if you have no advice in line with the exercise, this is not the place to offer it. Do not drift into confrontational or abusive demands that people adjust their restrictions to suit your cached suggestion, and do not offer unsolicited other-optimizing.
To alleviate crowding, Armok_GoB has created a second thread for this challenge.