i would not like that, being fat at big endurance wtf? makes completely no sense. Let people decide what model they want :>
Can somebody strong be fat? Yes.
Can somebody strong be slim? Yes.
Can somebody weak be fat Yes.
Can somebody weak be slim? Yes.
Can somebody clumsy be fat? Yes
Can somebody clumsy be slim? Yes
Can somebody agile be slim? Yes
Can somebody agile be fat? YES (I knew a guy that weighted over 100 kilo and he was quite good in capoeira (!)
I don't see much point with this idea. Why take away the choice when it can stay?
The only situation that could take away the choice from player should be picking small frame or bruiser - because those traits bluntly explain your physical look.