what is so surprising if you hear about his exercises and diet,then you will be more surprised he defeated all great wrestlers of his time including zybyzko,benjamin roller,frank gotch was afraid to face him and declined his challenge,he challenged many famous wrestlers but every one scared of him refused to accept it.there are proofs for this incident,and so stop saying it is a lie even before reading about him.
and don't forget he is the only wrestler in history to remain undefeated throughout his career(50 years).even bruce lee was his follower.
http://en.wikipedia.org/wiki/The_Great_Gama