Fighters moving down weightclasses?????

[goalkeeperkris]

Fighters that have very low bodyfat and drop weightclasses, do they just diet and train hard to intentionally lose muscle???
I am not talking about fighters cutting water to make weight for a fight.
Like kenny florian dropping weightclasses from lightweight down to featherweight in the ufc.
just curious

[BRAHregulator]

not to sure, most likely what you said. kenny was looking ill at the weigh ins.