Why is it very specifically the action of rubbing that triggers PEM for me?

M28, CFS/ME since 10 years

Why dors rubbing/scrubbing/polishing anything triggers PEM for me? I’m currently in a good phase, even able to do some heavy weightlifting and having some irl social interactions. But cleaning my house for 5 minutes seems to be too much for me.

I genuinely don’t understand. Also, that’s not something new, it’s been a thing I observed constantly over the last 10 years.

Thanks for your help