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

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.

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