Cardio on an empty stomach? effective?

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As a bonus, if you can drink some green tea before cardio, it helps IMO
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Thermorexin has both green tea and black tea extracts.

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What's the best thing to eat after an am cardio and how long should you wait before eating it??

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depends when u are on keto, than yes cardio on empty stomach.
when u are on balanced diet u better eat breakfast!