I got a few PMs from guys wanting to take a stab at this workout--how did everyone do? Is anyone sticking with it? I'm almost finished my 3rd full week and the results are great--I'm still sucking wind by mid way through the 3rd circuit, but finishing in the alotted time.
Also, for anyone who is doing it and wants a proper assist for this work out, order yourself a Gymboss interval timer--the hard part of these HIIT programs is timing yourself without having to stop and jimmy around with your ipod or smartphone, and I'd say setting up in front of the gym clock and doing circuit training is not in the cards for most people. This timer clips to your clothes or ipod arm band, has a couple settings (you can program your 60 sec interval and 15 sec rest time) and keep them on repeat so you never have to touch it. Plus, it has a vibrate feature (it looks like a smaller version of an old school pager) that allows you to keep going without stopping your music or turning off your timer alarm. For 19.95, it's a good deal and pretty useful is you workout at all.