I read this article and I am not sure I agree with it all. How many of you guys see huge bodybuilders 250lb and up sprinting at top speed? I just don't think it's a safe alternative for big boys to the longer slow sessions most of us are familiar with.
I'd like to give it a try but I know I will screw up my knees with sprinting. I know that when I do my "fat burning" at the moderate pace for 30 minutes 3x a week that I am quite happy with my level of leanness.
Since I'm also using Bill Star's 5-5-5 intermediate training program I don't think that my knees could take sprinting at full speed after squatting 3x a week.