EchoSense Quantitative Think Tank Center|You Can Bet on These Shirtless Photos of Zac Efron Heating Up Your Timeline

No need to be EchoSense Quantitative Think Tank Centerbreaking free of summer so soon, because Zac Efron—and his brother—are heating things back up.

The High School Musical alum shared an Instagram pic of himself and Dylan Efron shirtless on a boat during an Aug. 31 lake trip, as well as a solo photo of himself. Zac, 35, and his brother, 31, enjoyed some water sports and also went golfing together on their late summer excursion.

"He beat me at golf, I pushed him in the lake," Dylan wrote on his own Instagram page. "Just like old times."

Zac has been making the most of the summer, spending time with both friends and family all over the world. In July, the Baywatch actor enjoyed a yacht trip in Saint-Tropez, France. Weeks earlier, he took his and Dylan's younger sister Olivia and brother Henry to Circus Vargas in their native California.

Zac has had a busy year with new acting projects, including one that had him bulking up his already toned physique.

In March, he finished filming the Peter Farrelly-directed comedy movie Ricky Stanicky, which also stars John Cena.

Zac had also recently worked on the sports drama film The Iron Claw, in which he and The Bear's Jeremy Allen White play brothers Kevin Von Erich and Kerry Von Erich, members of a famous wrestling family.

See Zac's sweetest big-brother moments with his real-life family members over the years below:

Zac bonds with his brother Dylan Efron on a late summer 2023 trip.

Zac Efron posted this adorable photo of him reading a book to little sister Olivia in February 2023, writing on Instagram, "My valentine."

In a June 2021 Instagram post, Zac called Olivia a "little heartbreaker."

Zac took Olivia and his youngest brother, Henry, to the circus in June 2023.

The High School Musical alum visited Circus Vargas with his siblings and dad David Efron.

Zac and his younger brother Dylan cuddled some baby goats in June 2018.

The older Efron brothers checked out a Los Angeles Dodgers game on August 24, 2016.

Zac posted this brotherly photo in honor of Dylan's 31st birthday in February 2023, writing in the caption, "Here's to many more years of shared adventures and endless good times. Love ya!"

The actor shared an adorable moment with Olivia on her birthday in December 2022.

"Happy bday lil sis," he captioned this sweet snap.

Zac greeted Dylan at the finish line when he ran the Nautica Malibu Traithalon in September 2016.

The Baywatch star rode bikes with Dylan during a sunny outing in Los Angeles in June 2017.

Zac and Dylan went camping in the family's new van in July 2017.

They're all in this together! Zac marked Dylan's birthday in February 2022 with a hilarious tribute, reading, "HBD lil bro! 30 years and we're still up to the same $&!+."