I have two reasons not to use your system:
One: If you're committed to doing the action if you yourself can find a way to avoid the problems, then as you come to such solutions your instinct to flinch away will declare the list 'not done yet' and add more problems, and perhaps problems more unsolvable in style, until the list is an adequate defense against doing the thing.
One way to possibly mitigate this is to try not to think of any solutions until the list is done, and perhaps some scope restrictions on the allowable conditions. Despite this, there is another problem:
Two: The sun is too big.
I do not exercise.
(Caveat: I will refrain from taking any advice that would lead to me starting to significantly exercise until I have a diagnosis and a treatment plan of my apparent heart condition, which doesn't indicate it would be unsafe or otherwise a medically bad idea. I'd be really surprised if my doctor told me not to exercise, but in case she does I want to wait and make sure that my body is really lying to me when it says "don't do that, bad things will happen".)
Reasons (and existing known routes around each):
Sweat is horrible, and I overheat too easily. (Swimming gets around these; outdoor exercise in cold weather, interestingly, does not.)
Sunshine is horrible (and other environmental issues). (Anything indoors or at night gets around the sunshine thing. Other environmental issues are mostly limited to smelly gyms and excessively humid indoor pool facilities. Anything outdoors and at night and in nice weather gets around this.)
Many forms of it are financially costly (equipment, facility use). (Going for walks does not have this problem.)
It is boring. (When I tried jujitsu, it did not have this particular problem. Merely being able to listen to
It seems to me as if some bodyweight strength training exercises might not trigger any of these problems. I would suggest very small sets of comparatively high-load exercises, e.g. work your way up to one-legged squats, one-armed pushups, and chinups if you have a suitable thing to hang from or are willing to get a chinup bar (I sometimes do chinups on the metro). If you are interested I can give you some details on how to work your way up to these exercises, since many people are not initially strong enough to do them (I sure wasn't!).
Sweat: Short sets don't give you much of an opportunity to overheat or sweat. Also, with bodyweight exercises, you can do them at home and take a cool shower/bath immediately afterwards. (By the way, do you hate sweating, or do you hate being sweaty? I am assuming the latter for now.) You could even do the pushups in a cool bath to get some of the advantages of swimming.
Environmental Issues: You can do this at home and indoors.
Cost: Only the time investment, plus (optionally) the cost of a chinup bar.
Boring: This type of exercise does not take very long, so you won't have much time to be bored. Not very long means 5-10 minutes total, a few times a week. You don't even have to do it all in one session, you can take a minute at a time through the day.
As a bonus, strength training can make other sorts of physical activity less unpleasant, since you will be operating at much less than capacity.
I have tried to be reasonably concise here so as not to drown you in intimidating details and caveats, please let me know if anything is unclear and I can expand on it or try to say it another way. I included common names for some of the more unusual exercises, to aid you in Googling, but am happy to try to explain anything that is not obvious to you.
I hope this helps, but please let me know either way, as it will help me give better and more relevant advice in the future. Especially anything that doesn't work for you.
I am near-certain I do not currently have the strength necessary to do anything you have listed. The working up to it must also meet the criteria, but do tell.
Basically the idea is to do exercises that are less intense versions, and to do negative reps. Try doing the hardest exercise you can do. If at some point in the day you can't do it anymore then move one notch down. Once you can do 5 sets of 5 repetitions each in a day, try the next level up (no reason you shouldn't be ambitious and try it earlier if you feel like it).
Less intense versions of the 1-armed pushups
Regular pushups
Regular pushups with 1 leg off the ground
Ab pushups, sometimes called Superma
I wish to make the world a place where "Sunshine and sweating feel awful, so I'm not taking your advice" elicits the same reaction as "Putting my hand on a hot stove feels awful, so I'm not taking your advice", rather than being told to man up and being psychanalyzed by strangers.
I'm going to start with the subset of the world named Less Wrong.
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.