unless your PEM severity and duration depends on the magnitude and duration of the exertion
Sometimes the PEM observably does depend on exertion level & sometimes it seems irrationally out of proportion.
For instance ... dining table has looked like that for about a decade and a half
because if the paints were put away, getting out the needed ones can use up all the energy that was available to sit and do 15 minutes of painting on model parts.
(picture is from February this year & those little train and airplane and boat and spaceship and game people, and NASA rockets, still aren't finished)
So ... the paints get left out all the time so that when able I can just go and sit and paint for a bit.
There is a bit more paint in a box under the table.
Interestingly, the smaller the part being painted, the more rapidly the required concentration wears me out.
Why the dining table? 2 things: the 3 light bulb ceiling fan & that the vast majority of those paints are water based, or at least water soluble when still wet, acrylic, so, the 'paint thinner' is delivered to my kitchen faucet by the city utilities.
(hilarious to watch people's initial expression when in conversations about city water quality I say, "Yeah, our town gets its water from the river & it can taste like dirt when the river is either high or low, and sometimes we get paint thinner from the faucets.")
(yes the palette, even with a bunch of commercially available paint hues, I still enjoy mixing exactly the right hue desired)