Olympian Leryn Franco -- My Ass is World Class

The chick in this photo isn't just hot ... but she can impale you from 57 meters away ... 'cause she's former Olympic javelin thrower Leryn Franco.

The Team Paraguay athlete hit the beach in Miami this week ... showing off her world class physique in an itsy-bitsy bikini.

Franco shot to fame at the 2008 Beijing Olympics ... but it wasn't because she excelled in her sport. In fact, she downright sucked on the global stage -- finishing in 51st place.

Still, she wins.