So this is how Zac Efron stays in such great shape!
The "Neighbors" actor was spotted hiking over Memorial Day weekend while on vacation in Oahu, Hawaii.
Efron looked casual for his outdoor exercise, wearing a white muscle shirt, striped shorts, black sneakers, a backwards baseball cap and aviators.
Can you believe how buff the "High School Musical" alum looks?!
The 27-year-old actor wasn't hiking solo, though -- Zac was joined by "Pitch Perfect" star Anna Kendrick, who went makeup-free for their beach side hike.
Efron also shared a candid snap via Instagram on Monday, while standing on a mountain peak overlooking the gorgeous blue ocean.
"Trailing up the military pillbox hike in Hawaii and remembering our troops. Thank you for your service #Memorialday," he posted with the pretty picture.
Zac recently wrapped production for his latest comedy, "Dirty Grandpa," which he was off filming with Robert De Niro in Georgia back in April.
Here's to hoping next time Zac's spotted hiking sans shirt!
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