Sprint training?

Just watched a Mark Sisson talk and it reminded me that I'm not doing sprint training, which he (and others) say is really good for losing that last fat of your body.
Perhaps that is what's missing in my training. And he advocates doing it once a week, so that's not a lot of work really, for a supposedly very big benefit.
Guess I'll have to try it!

Of course, Mark Sisson does not think calorie deficit is the way to go to lose body fat, instead sprinting and eating more fat is his advice. Hmm, we'll see.