I dont know if you guys know this dude, he posts at Elite Fitness as well as on the Anabolic Fitness website. This dude is a professional model. He doesnt lie about what he does. His weightlifting workouts are a little off the wall by our bodybuilding, powerlifting, or even just recreational training routines/standards. But his cardio says it all. This dude stays in single digit bodyfat year round. He drops to 4 and 5% bodyfat for shoots and looks like he is made of freaking steal. Anyway, here is his cardio routine, and he does it 4-5 days per week. Keep in mind this is all done on a treadmill.
1min walk(3-4mph for all 1min walking periods)
1min sprint(12mph for all 1min sprinting periods)
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
1min sprint
1min walk
Then without stopping...
20 minute walk at 4.5mph at a 15% incline
Ill post a link to one of his pics.