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Mark-Paul Gosselaar

The Shirtless RIPPED Tide

3/13/2013 3:15 PM PDT BY Johnny Lopez

0313_mark_paul_gosselaar_breckin_meyer_splashAttention Bayside High alumni: Zack Morris is jacked!

Zack -- aka Mark-Paul Gosselaar -- showed off his lean, smooth and ripped 39-year-old pecs, bis and abs, while filming a surfing scene with his "Franklin & Bash" co-star Breckin Meyer and Eric Balfour in Malibu on Tuesday.

These days he's saved by the dumbbell.

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