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" ... Phil's findings were out of step with most of the standard American exercise discussion at the time. Standard advice was focused on aerobics, but Phil found himself focused on the anaerobic. Standard fitness advice tells you to exercise for a long period of time at a rate which leaves you breathing more deeply, but not panting, not 'out of breath'. In order to do this, you are told to aim at a heart rate which is approximately 70-80% of your maximum rate. Maximum rate is defined as 220 minus your age. At age 54, my maximum rate is 166. My target rate then would top out at about 133. If I go much higher than that I'm not able to breathe quickly enough to aerobically support my metabolic output, so I start burning fuel in a different way using different metabolic processes. Thus, I go from aerobic to anaerobic. We have both modes, aerobic and anaerobic, available to us. ... "