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by WalterBright 41 days ago
> Or when you are working at high heart rate close to your maximum.

When I was in college, running on the track, I decided to see how fast I could run by ignoring the stress and pain. My vision began rolling and surging in a weird way impossible to describe. I stopped and laid down on the ground, unable to do anything but pant.

I realized that what I had done was extremely stupid and never did it again.