Watch Mark Wahlberg's intense, shirtless 4 AM workout

Mark Wahlberg goes all out when it comes to his fitness.

The "Boogie Nights" star shared a clip to Instagram recently of one of his grueling 4am workout sessions, no shirt was worn in the process.

"4 am club with Doc @municipal," the actor captioned the post. He also included fire, sunglasses, the 100, and more emojis.

During the video, Wahlberg's trainer tells him to keep going and breaks down the muscles that were being worked on during each different exercise.

Wahlberg utilizes a resistance band machine in the post, which the trainer said is good for "shoulder stability work."

He also hits an ab roller wheel workout which the trainer calls "one of the toughest exercises." However, Wahlberg makes it "look easy."

The movie star's fans were vibing with the inspiring post as it has nearly 40 thousand likes.