I have heard that you should not work out one hour before or one hour after eating. This is supposedly because during digestion, your body channels a lot of blood to your digestive system, thus depriving your muscles of this blood to lift (if you eat before) or to rebuild (if you eat after).
Also, I've heard that working out in the morning will increase your metabolism for the rest of the day, allowing you to burn more fat. (If that's what you want to do.)
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EVERYBODY HAS THEIR OWN AGENDA