6. Body-Fat Percentage (MONTHLY)
WHAT IT MEASURES: How much fat is in your body.
WHY IT’S KEY: It’s a more accurate replacement for body mass index. The knock on BMI is that it doesn’t differentiate between fat and muscle. For instance, if you’re on a fitness kick, your scale reading may stay the same (or go up) even though you’re losing fat and gaining muscle. More muscle mass corresponds with a faster metabolism, healthier bones, and better cardiovascular health. One shortcoming: Body-fat percentage doesn’t distinguish between subcutaneous (or “surface”) fat and visceral fat, so it’s useful to think about this and waist size together. Find yours using a smart scale.
AIM FOR: 6 to 17 percent.
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