Joshua Jackson is opening up about his experience on the set of Karate Kid: Legends, and it involves a valuable lesson learned about bringing his 5-year-old daughter Juno to the film's set.

The 46-year-old actor recently attended the film's premiere on May 27, where he shared with PEOPLE that bringing his daughter to watch him film the project was a "really stupid thing" to do.

"She came out to visit Montreal for five, six days because my brother lives up there, it was a family trip and I brought her on set the day that we were doing the fight scene," Jackson explained. "That was really dumb. She did not like seeing her dad get beat up."

Jackson, who shares Juno with Jodie Turner-Smith, believes that was the first time he'd ever brought her to work. Although things didn't go as planned, the proud dad has summer plans for his little one.

"She graduates from school or from [Transitional Kindergarten] TK in a couple of weeks, and then we got some summer camp and we'll figure it out after that," he said.

In Karate Kid: Legends, Jackson plays Victor, a former boxing champ and pizzeria owner. To play the role, Jackson told the Today show that he gained 20 lbs. "I walk around 175. I was almost 195 for the film," he shared on television earlier the same day, noting: "It was harder than I thought it was going to be. I was eating 4,000 calories a day."

He reiterated the same sentiments while speaking to PEOPLE, noting that the most challenging part of filming the movie was the eating. "I had to eat so much food to put on all that weight and it seems like that should be easy and fun, but turns out it's not," says Turner.

Karate Kid: Legends will be released in theaters on Friday, May 30.

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