Stuck inside, got nothing better to do, so lets look at some numbere, FFMI is basically a formula that calculates how much muscle a person has compared to his height. It can be a bit flawed cuz it doesnt take bone structure into account, but unless you're built like a stocky neanderthal it's most likley not gonna be an issue. An FMMI over 25 would mean you are 95%+ likley not natrual, or you have top of the food chain genetics, over 26 and there's basically no chance you're natrual. In fighters these numbers would be even lower, anything above 24 would be
very suspect, most of boxing or mma training is very catabolic, hitting the bag, pad work, sprints, road work, sparring... Most of the muscle you build from weight training would be getting burned off from all the cardio. A bodybuilder and a fighter do not have the same type of training, not even close.
Lets take a look at someone like Arnold Schwarzenegger, pro bodybuilder, mr.olympia, obvs not natty.
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FFMI comes out at 28-28.5
A silly example but a good baseline.
One of the hardest hitters ever, Francis Ngannou.
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6ft4, around 255lbs, doesnt cut weight, body fat not lower than 12%, not higher 15%, so lets give him the full benefit of the doubt and say 15%, FFMI comes out at 26.3, at 14% its 26.5, at 12% its 27.3
Next lets look at the boxing golden boy Anthony Joshua
View attachment 753861 In the first Ruiz fight, 6ft6, 247.8lbs, about 12-13% body fat, FFMI 24.8-25.3
Tyron Woodley
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Height listed as 5ft9, prob closer to 5ft8, in cage weight is around 190lbs bf is about 10%, FFMI 25.5-26
Paulo Costa
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6ft1, inside the cage 213lbs vs romero, bf 11-12%, FFMI 24.7-25.3
Yoel Romero
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Height listed as 5ft11, in cage weight slightly above 200lbs, bf 9-10%, FFMI 25-25.5, also above 40 years old...
GSP
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5ft10, cage weight 185-190lbs, bf 11%
FFMI 23.5-24.3
Mike Tyson
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5ft10, weight was about 218lbs, bf 12%
FFMI 27.5, all this at 19-20 years old...