From personal experience, I found interval sprints to be the most productive for me. Sprint as fast as you can for 30 seconds. Then rest and walk for 90. Sprint for another 30 after that and repeat the rest interval...do about 4 intevals all together (you should be exhausted at the end of this).
Over the summer I would do a light half mile jog to warm up, then run the 4 intervals....I got really lean and really cut.
Try coupling this exercise with a regular weight lifting program....as more muscle mass should help burn calories even while at rest. Best of luck!
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