If I drink a full cup of good coffee before exercise I'll likely die of heart attack. My heart is starting to literally ache after I get 3 normal gulps of coffee and wait for 15 minutes.
Other anti-oxidizing drinks like green tea do help a lot though.
It really depends on the person. I was a former coffee addict and even though I mostly have quit coffee for full 10 years now I still can't get back to regularly consuming it. It's either half a cup once two weeks or a very shitty 2-3 days after.
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