TL;DR: if you're consistently extremely low on energy, especially if exercise comes with mental 'fog' or delayed feelings of being drained, do not follow medical advice to gradually increase exercise to rebuild capacity until you've read up on #ChronicFatigue and #PEM (post-exertional malaise).
This one hits quite close to home; Monbiot in the Guardian gives a searing but accurate look at how poor support for anyone with #ChronicFatague / #ME / #LongCovid is in the UK and Europe - which probably includes millions of people. Why do I know it's accurate? Because I've been out of work for well over 18 months myself suffering from the condition, and I have been given exactly the bad advice in the article and had exactly the same dismissal from doctors (apart from the sexism, but that's only because I was 'lucky' enough to be born male). I don't spend a huge amount of time in the opinion sections of newspapers, but sometimes things end up there because nobody actually talking about them as news.