I too have days when I physically can't do things. It's like trying to move in a tank of molasses. Is this what you are meaning CJulian ? Not that I don't WANT to move ,just that I CAN'T. My brain just won't kick in and push me on . I'm not sure what exactly you do mean to ask, so I'm not much help. On such days,I do count my basic household chores as exercise. When you live alone ALL the chores are yours. So instead of being hard on myself on such days, as @A MyParkinsonsTeam Member has said, I congratulate myself that I have completed household tasks that a couple together would share.ie; perhaps one would take out the trash,the other might fold the laundry; they might make the bed by standing one each side; one might cook,and the other cleanup. As a single person, at least I'm moving.
Not so very helpful sorry.💐

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A MyParki...

Yep, I have the same things happen to me! Get up after a sleepless nite & then AFTER EATING - watching Tv news go to sleep for a while, DON'T push, it is a disease, & most likely you will be living with it for the long term,just go along with it & if you need to "get some gas along the way " stop & get a refresher " (nap), DON'T WAIT UNTIL THE TANK IS EMPTY, take a nap, rest, pause, whatever it takes to maintain yourselfO MAINTAIN IT IS not A RACE BUT A MARATHON & SPEED OR "PUSHING YOURSELF" WILL NOT "Git R done"!

It is fatigue that fuels the inertia I'm thinking @A MyParkinsonsTeam Member. I've realised that when I'm fatigued I've been most finding it difficult to move, when most my sofa is calling me. I had a day last week when I just had to keep lying down. I think that I even dozed for 10 mins or so, then I would get up and move some, maybe complete a task, but inevitably I ended up back on the sofa. I can't seem to post a photo here. But I was motivated to keep trying to move by a poster I found. I posted it yesterday on my page. It's about moving and the sofa :-)

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A MyParki...

I agree with Margarita40 that we do better if we don't compare ourselves to others. I get along much better now that I just listen to my body. If I feel good, I exercise a bit and do some housework or buy groceries. When my body doesn't want to move, I take a nap and do only easy tasks that day. I live alone so I can give in to apathy and inertia without affecting anyone else. Once in a while I have to push myself--like this weekend when I have four grandkids (ages 1, 6, 8, 10) for two nights--but it's my choice and I know I will have to lie around next week to recover. We have to be kind to ourselves!

I remember somebody here saying that exercise gave them (or spouse?) more energy, which I believe, but how to get that exercise thing going in the first place?? Anybody have ideas? Would love it if an exercise buddy would come over and say, "Ok, time to get going..." every day... and then applaud whatever I managed... My get up and go has 'got up and went,' and I need somebody else to chase it around the neighborhood and bring it back to me on a leash... ;-)

At least it helps to know others know exactly what I'm talking about. Will also look into the fatigue angle; I wholeheartedly agree that physical energy is a significant part of it. Thanks, @A MyParkinsonsTeam Member, for that comment.

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A MyParki...