Zac Efron Muscles – High School Musical 3 star Zac Efron sporting big muscles after a year of heavy weight training, bulking up with nearly 20 pounds of added muscle.

Zac Efron muscles bulging after workout in LA July 16, 2008

Check out the Zac Efron muscles comparison from last year to this year:

Zac in 2007 without a whole lot of extra muscle

Zac in 2008 with heavy pecs and big guns

The new Zac Efron pictures were taken July 16, 2008 as he exited a gym at the Toluca Lake Tennis Club in LA after spending an hour lifting weights and working out.

And that’s the latest on the new Zac Efron muscles.

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