On top of being boring, treadmills and stationary bikes aren't very manly. Rocky Balboa knew this. That's why he preferred dragging a sled through a frozen field to get his cardio.
But you don't need to live in a cabin in Siberia to get a real man's workout. Try these tips from Cameron McGarr, head of personal training at Equinox in Woodland Hills, CA , for a cardio routine that will kick your ass.
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Strap on a weight vest or grab a pair of dumbbells and take to a step mill (or a set of real stairs) and get climbing. Keep the speed at a manageable pace. The weights provide plenty of intensity.