If you were "training" 2 weeks after the fever went away, congratulations - you didn't have long covid.
You cannot exercise your way out of Long Covid, or other postviral fatigue syndromes - it presents identically to Chronic Fatigue Syndrome. Any attempt to exercise - even something as small as a short walk, or in severe cases merely taking a shower - results in a hard crash that feels completely unlike exercise fatigue, and can effectively confine you to bed for days. And every time you provoke a crash, you set back your recovery, potentially permanently. And you can't really tell by feel what your limits are, you just have to work it out analytically and be conservative. And the whole time, your brain feels like mush.
You cannot exercise your way out of Long Covid, or other postviral fatigue syndromes - it presents identically to Chronic Fatigue Syndrome. Any attempt to exercise - even something as small as a short walk, or in severe cases merely taking a shower - results in a hard crash that feels completely unlike exercise fatigue, and can effectively confine you to bed for days. And every time you provoke a crash, you set back your recovery, potentially permanently. And you can't really tell by feel what your limits are, you just have to work it out analytically and be conservative. And the whole time, your brain feels like mush.
It's really no joke.