I am a sterling example of:
Human beings adjust behavior based on the metrics they’re held against. Anything you measure will impel a person to optimize his score on that metric.
A daily weigh in on the Wii Fit helped me lose 15 pounds in 2010 (I gained about five pounds back over the next three years). I received a Fitbit Force as a present last year and I was able to ride that for another 15 pound loss. Another 15 pounds and I can declare victory.
I’d like to have a heart rate sensor in my next fitness tracker. The Fitbit Charge HR or Surge might be the answer. I just don’t know if I can wait that long - a new fitness tracker would be a great Xmas present.