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And apparently they're so infantile and stupid that they need to pay a professional to tell them if they can stand up, or take a step.

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No, but maybe they have a pre-existing condition and could be in danger if they walk too much or walk uphill--and may not possibly realize it?

A friend of mine, who is obese and takes a lot of medication, and also who has recovered from COVID, started getting really lightheaded when we walked uphill about a block to our parked car.

Sounds like your friend realized it. Listening to your body and seeking out professionals if it sends negative signals is probably a better strategy than asking a doctor before any activity, unless you already know you have serious medical conditions.

I was once in a similar situation where after recovering from surgery I found I could only walk short distances before becoming lightheaded and tired. I asked a medical professional for advice. He told me to get over it. I'm lucky I didn't have to pay for this information.

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