Sprints alternated with Torso sprints (Upperbody cardio machine) and walking. My bi's get pumped to such an extreme it's actually painful then I start to feel sick. Sprints usually follow 30-40 minutes of cardio.
The 20 rep squat routine that I posted. I usually get sick after the 2nd set of supersets. I'm not sure if it's the one set of curls (down the rack) that stop when I can no longer curl a 15lb straight bar that I do right before the abs. <img src="http://www.massmonsters.com/infopop/emoticons/icon_redface.gif" alt="Red Face" width="15" height="15"><!--graemlin:
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Out of the choices it's most definately rest period (60 secs).
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8D~