Stocks also represent a company’s net asset value. So, unlike crypto, a shareholder would be compensated by the sale of a company’s assets in the event of its liquidation. Crypto has no such safety net.

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MIT Professor Paul Samuelson’s famous quip, “the stock market has predicted nine out of the last five recessions”

Acid buildup in muscle tissue. Here is an article that explains what is happening:

https://www.pfizer.com/news/articles/science_fact_or_science_fiction_lactic_acid_buildup_causes_muscle_fatigue_and_soreness

Esit: I originally said that your.muscles are creating waste chemicals quicker than your bloodstream can handle causing those bad chemicals build up locally. While this is true in a broader sense, I think it is more nuanced that that. Reading the article should give a better explaination