Fat Free Body Weight Average. Ffmi is conceptually similar to body mass index (bmi). On average, a healthy lean body mass percentage depends mainly on age and sex.
Your body was designed to store fat so it would have reserves of energy during famine. Body fat also changes with age. Ideal body fat percentages by age group are as follows:
Normal ranges for %bf were 13.4 to 21.7 and 24.6 to 33.2 for men and women, respectively.
The average male scores about 19 and it is hard to score above 25 without using steroids or other banned substances. Let’s take for example a fitness enthusiast with a weight of 180 lbs, 12% body fat and 5 ft 10 in height. Ffmi (fat free mass index) is a formula to quantify muscle development based on your height, weight, and body fat. Bodybuilder / powerlifter / weightlifter