The only problem I have with the new craze of bio-feedback devices is that they tend to do just the opposite of what they’re designed, and that is to motivate you through bio-feedback. The physical activity that one trains in is very specifically automated in the brain. So, to return to thinking, by incessant reliance on automated devices, even for motivational purposes, is the key to transforming an expert back into an amateur. This phenomenon known as paralysis by analysis is the primary reason most people fail at anything. And frankly, those of you who are obsessed with what I affectionately term, “the Numerology of Fitness”— that is, obsessing over every calorie or what you should or should not eat, are programming yourself to failure. Every calorie you burn or every gram of body fat you successfully burn will be met with staunch opposition by your brain, and therefore you will either hate the journey, or give up on it entirely.