I think that will smith did do the movie ali naturally i mean look at how he is built i don't think that the could gain fat if he tried in the movie bad boys he had a pretty lean physique too, so with his body type i am pretty sure working out hard, eating right and often, and take good supplements, like creatine, some good mrp's, and some carb drinks I am pretty sure hke could have gotten his physique naturally, not to say he didn't juice, but i think with the rest of the names mentioned on these posts I would think that him and tobey from spiderman could have gotten their physiques naturally