http://en.wikipedia.org/wiki/Plato

“According to Diogenes Laërtius, the philosopher was named Aristocles after his grandfather, but his wrestling coach, Ariston of Argos, dubbed him ‘Platon,’ meaning ‘broad,’ on account of his robust figure.”

… broad chest and shoulders being a sign of manliness. More…

http://en.wikipedia.org/wiki/Early_life_of_Plato

“He excelled so much in physical exercises that Dicaearchus went so far as to say, in the first volume of his Lives, that Plato wrestled at the Isthmian games and did extremely well and was well known. Apuleius argues that the philosopher went also into a public contest at the Pythian games.”

See also how Plato is portrayed in the (recommended) “Action Philosophers” series…

http://www.eviltwincomics.com/aphil.html