Interval Training article by John Berardi
Interval Training - Are You Doing It? by John Berardi
John Berardi had the chance to sit in on one of George St. Pierre's workouts before the last UFC fight. He sums it up with:
And while some might say I was lucky enough to sit in on a sparring session and a conditioning session, my lungs might beg to differ.
The article has the circuit they used for HIIT, and a follow up by strength coach Mike Boyle, in which he gives you the tools to create your own HIIT program, including which equipment is most effective and/or safest.