There's aerobic and anaerobic... and there's also phosphocreatine.
Interesting bit of trivia about energy use during exercise, from a new paper in theEuropean Journal of Applied Physiology by researchers in Portugal. We (i.e. endurance-oriented folks) normally think about two different types of energy production: aerobic and anaerobic. Aerobic is what dominates for longer, lower-intensity efforts, where your hearts and lungs are able to keep pace with the oxygen demands of your muscles. Anaerobic comes into play for shorter, higher-intensity efforts -- and we usually associate it with lactate, which is a by-product (as well as a fuel) in the reactions that produce ATP without oxygen.
Read more at... http://www.runnersworld.com/race-training/the-third-energy-system