Bodybuilders Phil Heath and Kai Greene clash at Mr Olympia press conference

This year the 2014 Mr. Olympia contest is celebrating its 50th anniversary and it could not have started any better. With only 13 winners in its entire history, the title of Mr. Olympia is the ultimate prize for any professional bodybuilder.

Three time Mr. Olympia winner and reigning champion Phil Heath was not happy with Kai Greene during the 2014 Mr. Olympia press conference.

It all started in 2013 when Kai Greene signed a poster indicating that he was the 2013 Champion. Phil Heath was not happy with this as he viewed this as disrespect for the reigning champion.

Yesterday afternoon, at the athletes meeting for the 2014 Mr. Olympia, the signing of the posters from all the athletes took place and again, Phil Heath noticed the same signature: 'Kai Greene - 2014 Mr. Olympia'.

Kai Greene's signature on the 2014 Mr. Olympia poster

In the footage below you can clearly see the current champion Phil Heath was not happy when he noticed the signature and as well during the press conference the incident escalated when they came face to face.

Many great stars have been discovered thanks to the Mr. Olympia contest, including seven-time winner Arnold Schwarzenegger and Lou Ferrigno.

Stay up-to-date with all the events at the 2014 Olympia Weekend by visiting www.evolutionofbodybuilding.net