Fat-Free Mass Index in NCAA Division I and II Collegiate American Football Players. - PubMed - NCBI

www.ncbi.nlm.nih.gov

FFMI around 30 in NCAA division 1 football. No, I don't think these guys are naturals!

"Upper limit estimations for FFMI seem to vary by position; although the 97.5th percentile (28.1 kg·m) may represent a more suitable upper limit for the college football population as a whole, this value was exceeded by 6 linemen (3 OL and 3 DL), with a maximal observed value of 31.7 kg·m. Football practitioners may use FFMI to evaluate an individual's capacity for additional FFM accretion, suitability for a specific position, potential for switching positions, and overall recruiting assessment."

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