Goon, heres an interesting article all about cardio.
I disagree with it about the morning thing. IT claims to do cardio when you are feeling your best. I kinda disagree with this statement, because it believes you should do cardio at night or later in the day when you are loaded with energy.
IMO, your fat will not get used if you do that. You only feel loaded with energy because your glycogen stores are all full. Doing cardio in the morning, your body is forced to use the fat for energy. Thats why I personally believe cardio in the morning is better.
Also, your metabolism gets spiked if you work out in the morning, thereby you should be burning more calories the rest of the day. If you do cardio in the evening, then go to sleep a few hours later, you dont get quite the same effect, its like you are working against it. Thats just my 2 cents.
Besides, after about a week of doing it in the morning, your body starts to EXPECT you to be doing workouts in the AM and you awaken much easier, at least i do now.
In fact, I cannot believe i did 12 weeks worth of workouts prior to these past 4 weeks now at night. I wish i woulda done them all in the morning.