The form of a man throwing a discus was a common depiction in Greek and, then later on, Roman art. The original bronze is lost unfortunately, but numerous Roman copies remain, two of the most impressive done in the to-be-expected-marble. These sculptures are amazing though in the way they capture a moment of tenuous movement, the moment right before the rapid turning of the athlete to launch the discus. The strength of the male body is evident in all versions of this captured act as they are nude as was the typical Olympic fashion.
The above Townley Diskobolos, though legitimate in that it was discovered at Hadrian's Village, is said to be a poorly repaired sculpture as the head was positioned incorrectly.