I'd wait a day.
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Excerpt: I went and I donated blood it was really easy it took me about 20 minutes in and out and I got a free ticket to the movies haha. The lady there said I should hydrate and not workout. she said that I had some thick veins and it was really easy to stick me. Do any of you go work out after donating blood or should I take her advice and take a day or two off
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I'd wait a day.
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If you feel fine, go for it, no issues
No issue at all bro!
take a break