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Do I need to eat breakfast and then drink a shake before lifting?
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It is important to have some nutrients in you before a workout. Some people eat eggs and oatmeal and some people just throw back a shake.
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But I don't eat breakfast before doing cardio, but still take a shake?
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I don't think you have to eat before cardio,some say it's better not too. Just make sure you have something after or you can sip on some BCAA's during.
Not sure about the heart rate, but I don't think that there is a magic number or time for when you start to burn fat.