A little broken jaw can't keep Zac Efron down.
Four days after the incident that left his jaw wired shut, Zac was seen back at the gym, hitting the weights hard to ensure no lapse in our devotion.
"He looked great," an onlooker tells PEOPLE. "But it was all business. He was concentrating on hitting the weights hard."
Wearing long sleeves and nylon pants, the former High School Musical heartthrob sported what looked like a fresh haircut slicked over to the side as he used a rowing machine to perfect his deltoids.
"He seemed really pensive and was looking around to see who was looking at him," the onlooker says of the actor, who completed a stint in rehab earlier this year.
While Efron showed no signs of his recent injury, the onlooker noted that he was not seen moving his mouth, which was wired shut after the accident.
Coincidentally, we'd probably need our jaw wired shut in order to not embarrass ourselves if we ever ran into Zac on the workout floor!