The best way to train to burn fat is ...
Much weight, short rest
Researchers at the University of Oslo sports and exercise concluded that using a weight that allows only be lifted by 6 repetitions increases metabolism longer than exercises series but with lighter weight for 12 reps.
Similarly, the University of New Jersey, I conclude that when resting only 30 seconds between sets, burns up to 50% more fat than when resting 3 minutes between sets.
So if you burn more fat, using a range of 6 to 8 repetitions also rest between sets of less than one minute.