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Originally Posted by intellijence
When doing cardio, your body has 2 sources of energy to choose from...glycogen/glucose and/or fat. When lifting, the body has virtually 1 source of energy - glycogen/glucose.
If you do cardio (extensive, not warmup) before lifting and burns up the glucose before you start lifting the body has to get more glucose (Muscle can make glucose for the body.)
If you lift and then do cardio, lifting burns up glycogen before starting cardio meaning your body has to use the other source of energy (FAT)
The thing is if you do the same things every day you get less caloric expenditure from them. Also, as you lose weight the number of calories expended from an activity declines. Therefore you should vary training to keep your body from getting accustomed to it (every 2-3 weeks).
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It helps to train your body to use fat for fuel by the way you do cardio. Working at less than 85% of max burns more fat, trains your body to process fat more effectively and builds your cardio base. That will move up the line on where your 85% really is. Lower than 85% trains your aerobic and endurance while above that is anaerobic and burns primarily sugar for fuel but also works your heart more.
All the bike riders are skinny. not because they are running at high intensity all the time but because they built their aerobic base, processing more fat for fuel which the body has a great store of (rather than sugar which burns off from what you've eaten) and increases both their physical endurance and their energy source endurance. See the link below:
http://www.duathlon.com/articles/1460