Good + Good = Bad
Donating blood is good.
Exercising is also good.
However, exercising the morning after donating blood is not so good.
You may realize, say, halfway through your morning run, that the lack of blood cells to carry oxygen to your muscles affects your stamina somewhat.
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Remember in between the resting with your arm up in the air and the cookie when they said not to do anything strenuous for about 24 hours? They aren't kidding.