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Lifting weights at first, especially heavy weights, will make you tired enough that it can be difficult to do cardio later. So you will not be able to complete your workout and will not get the calorie-burning benefits of cardio. However, theoretically, first gaining weight will put your body in aerobic mode and so when you get your cardio, you will already be in a state of fat burning. If you are training with light weight, it will help increase your heart rate and prepare you for an intense cardio workout.
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