Cardio Cocktails:

A term I heard floating around the internet to refer to steady state aerobic training using different machines in the gym. You could do 15 minutes on the rowing machine as a warm-up, then jump on the bike for another 15-20 minutes, then finish it off with a jog/walk on the treadmill. You could use any combination of 3-4 different machines for anywhere from 10-20 minutes.