The Fat-Free Mass Index (FFMI) is a crucial metric for assessing muscle mass, with targets of 20+ for men and 18+ for women, assuming a healthy body fat percentage. Scores below 17 for men and 15 for women indicate severe physiological detriment due to insufficient muscle.
Impact: High. Understanding FFMI provides a quantifiable target for muscle development, highlighting the risks associated with low muscle mass and guiding individuals on their physique goals.
In the source video, this keypoint occurs from 01:28:18 to 01:31:04.
Sources in support: Andy Galpin (Guest, Professor of Kinesiology)

