People working out at F45 in Medford on Tuesday found an extra member in their exercise session — actor Mark Wahlberg.

Wahlberg, whose investment company has a stake in F45, stopped by to participate in workouts.

“I made sure that I wasn’t too close him because I would’ve gotten distracted,” said gym member Amanda Jo. “I’m just glad it was a more strength-based class and not cardio.”

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