Matthew Morrison’s Secret to Ripped Abs: Sweet Potatoes?

Matthew Morrison

updated 04/06/2011 AT 6:00 PM ET

originally published 04/06/2011 AT 6:30 PM ET

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.

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