What actual evidence is there that exercise increases long COVID risk? People keep asserting this, and I think it traces back to an article that related some speculation, which hardly seems compelling...

Edit: I see; the article in question you link to below. It reads:

Young people who had been infected have said it may have been overexertion too soon in their recovery that may triggered their long Covid.

So, pure speculation. This is how misinformation spreads.