It's been a very eventful few weeks for fans of Zac Efron without a shirt on [1]: the actor has been hitting the beach on the Florida set of the Baywatch movie in different costumes — none of which include a top — and this week, he linked up with costar Dwayne Johnson [2] to film what we can only assume is some sort of action-packed, muscle-filled montage of them rescuing a few kids from drowning in the ocean.

Both Zac and Dwayne — along with their female costars [3] Ilfenesh Hadera, Kelly Rohrbach, and Alexandra Daddario — kicked off filming of the '90s series adaptation last month and have been spotted looking hot while shooting their scenes [4]. Keep reading to see their latest on-set photos!