heart rate zones (easy to find on the Internet), the ambiguity non-fitness-experts feel with respect to exercise is removed.
1. Take your “before” circumference measurements. Get a simple tape measure and measure four locations: both upper arms (mid-bicep), waist (horizontal at navel), hips (at widest point below waist), and both legs (mid-thigh). Total these numbers to arrive at your Total Inches (TI). Changes in this total will be meaningful enough to track.
BodyMetrix
It turned out that, with each change, the workers suspected they were being observed and therefore worked harder. This phenomenon—also called the “observer effect”—came to be known as “the Hawthorne Effect.”