I'm assuming youre joking, but you might not be.... You do AM cardio on an empty stomach cause during the night your body starts to use Free fatty acids for fuel over stored carbs..... So, when you wake up, your body is in fat burning mode, and it's ready to burn some fat..... If you do cardio before eating any calories, your body will continue to use Fat for energy during your cardio...... This means that your entire cardio session is being fueled by stored fat..... It's the best time to do cardio.... You don't need fuel to do cardio, gotta keep the cardio realitively light if your lifting for muscle anyway, so stored fuel is plenty.....
As for the lifting weights on an empty stomach...... I gotta say it's prob not a good idea, unless youre really endomorphic and have alot of BF to lose.... If that's the case, your 1st goal is Fatloss, not muscle growth, so no calories before lifting could be good..... I'm Endomorphic, but I don't have much fat to lose now, so I have a protein shake 2hrs before working out, and that's it..... It has a small amount of carbs, but not much..... I'm strong as hell in the gym, no probs at all..... Like you've heard a million times on this board, everyone is different..... You gotta do what works for you, and what your goals are..... Try it out for a bit if you wanna see what it does for ya.... Learning what works for you is what this game is all about....
rizz