Ripped Zac Efron takes on The Rock in pull up challenge

By now, we're all aware that Zac Efron is in pretty decent shape ahead of the new Baywatch film.

https://twitter.com/ZacEfron/status/706357316287762432?ref_src=twsrc%5Etfw Having made the transformation from a floppy-haired Disney poster boy to absolute monster, it's also emerged that the 28-year-old has been spending time working out with Dwayne 'The Rock' Johnson. https://twitter.com/ZacEfron/status/706561869994020864?ref_src=twsrc%5Etfw In fact, as pointed out by a post on Johnson's Facebook page, they've recently engaged in a pretty intense pull up competition. Unfortunately for Efron, it appears that the apprentice isn't quite ready to take over from the master just yet.