Zac Efron shows off his rippling muscles as he shares shirtless photos

He may be exploring the great outdoors in his web series, Off The Grid.  <br> <br> <br> <br> But Zac Efron is still getting pulses racing during his adventures. <br> <br> <br> <br> The actor, 31, posted a photo of himself exploring Crowley Lake by boat, shirtless. <br> <br> <br> <br> H2-Oh! Zac Efron posted a shirtless photo of himself exploring Crowley Lake by boat on Wednesday <br> <br> <br> <br> The head-turning snap showcased the handsome actor sitting in a boat alongside his buddies, as he gazed towards the calm lakeside. <br> <br> <br> <br> Zac appeared contemplative while sitting on the boat, wearing just a pair of shorts, sunglasses - https://sunglasses.guru , and hat. <br> <br> <br> <br> RELATED ARTICLES<br> <br> Previous<br> <br> <br> <br> 1<br> <br> Next<br> <br> <br> <br> Lily Collins shows off her sporty side as she steps out in... Vanessa Hudgens and 'new Elvis Presley' Austin Butler... Zac Efron and Anna Kendrick star as cave dwellers in trailer... Zac Efron takes the plunge into an ice cold bath while... <br> <br> Share this article<br> <br> Share He captioned - http://www.superghostblogger.com/?s=captioned the photo with various nature-themed emojis, including a pine tree and sunshine emoticon.<br> <br> <br> <br> The actor got even more people talking a day earlier, when he posted another shirtless photo while stacking rocks.  <br> <br> <br> <br> He rocks! The actor got even more heads turning while exploring the rugged terrain sans shirt<br> <br> <br> <br> Penny for your thoughts? Efron appeared deep in thought as he took a breather beside the peaceful lakeside <br> <br> <br> <br> The photos put his defined physique - https://www.google.com/search?hl=en&gl=us&tbm=nws&q=defined%20physique on full display as he explored the rugged terrain.<br> <br> <br> <br> The pictures were taken as part of his web series, Off The Grid with Zac Efron, which chronicles his explorations into the great outdoors. <br> <br> <br> <br> 'Outdoors and adventure with my best friend and brother, Dylan. Come along with us as we travel the world and get out of our comfort zones!' the show is described on Zac's YouTube channel.<br> <br> <br> <br> Happy camper: Efron was enjoying a road trip with his buddies<br> <br> <br> <br> Hitting the road: The pictures were taken as part of his web series, Off The Grid with Zac Efron, which chronicles his explorations into the great outdoors<br> <br> <br> <br> Zac has been using his YouTube channel as a platform to share various aspects of his life, from life at the gym to recovering post-exercise.<br> <br> <br> <br> When Zac isn't exploring the great outdoors, he is lending his voice to various animated shows. <br> <br> <br> <br> The actor is currently starring in the animated comedy series Human Discoveries with Anna Kendrick, and will be lending his voice to the character Fred Jones in the upcoming film Scoob, which is based on the Scooby-Doo series.<br> <br> <br> <br> Toon much fun: The actor is currently starring in the animated comedy series Human Discoveries with Anna Kendrick,<br> <br> <br> <br> Advertisement