Thailan Pham
April 06, 2011 06:30 PM

Matthew Morrison is known for his ripped physique – but how does he do it?

The Glee star, 32, who shows off his washboard abs in a series of beach photos in a recent issue of Details, also reveals a slightly unusual diet secret.

For three days before the photo shoot, the actor, who plays McKinley High’s glee club leader Will Schuester, ate nothing but sweet potatoes.

QUIZ: Guess the Abs!

“I had to have a six-pack on show,” Morrison told the U.K.’s Sunday Mirror. “The potato acts as a sponge and your body literally shrinks and gets ripped and tight.”

But not to worry, the actor promises he has given up the spuds-only diet since then: “Afterwards I ordered two pizzas and pasta!” he says.

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