Rule #5: Whenever possible, measure your progress in body fat percentage, NOT total pounds. The scale can deceive and derail you. For instance, it's common to gain muscle while simultaneously losing fat on the SCD. That's exactly what you want, but the scale number won't move, and you will get frustrated. In place of the scale, I use DEXA scans, a BodyMetrix home ultrasound device, or calipers with a gym professional (I recommend the Jackson-Pollock 7-point method).