If can't get a good workout in because you feel tired without your breakfast... than eat your breakfast. (ashotofadrenaline.net)
And once you're there, it can be hard to get a good workout when your brain is still half asleep. (mindbodygreen.com)
You won't get a good workout if you always have to wait for your partners to do their sets and you will probably end up talking too much. (hardgainermusclebuilding.com)