Basically any cardio machine would do, I can do HIIT on an elliptical on a bike, StairMaster, rowing machine. All you need is a gymboss and some fast music! Actually Cardio Coach has many good CDs that are HIITish, also some of the itrain "climbs", and "cycles".
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12 marathons
2 ultra marathons (50k)
PR: Mohawk-Hudson Marathon 3hr 40min
"You finish when you are done not when you are tired."
David Goggins
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