The seriously ripped star showed off his set of washboard abs on the set of Baywatch. "Months and months of training for this moment," he wrote in the caption of an Instagram post from the set.

Brett Kaffee/Thibault Monnier, © Pacific Coast News
InStyle Staff
May 28, 2016 @ 9:45 am

With Memorial Day weekend upon us, we’ll take a six-pack, please! This summer is bound to give us another peek at the sexiest abs in Hollywood, which is why we're getting ready by gathering all of the hottest of years past in one place. On our list: Zac Efron (above, during a Baywatch movie shoot), Liam Hemsworth, and Joe Manganiello.

RELATED: What Zac Efron Ate to Get His Killer Baywatch Bod

Click through the comprehensive gallery of all the rippling, glistening abdominal muscles you can handle—we just hope you have air-conditioning.

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