Jillian Michaels shared her go-to rule for avoiding holiday weight gain .

During an interview with Fox News Digital, the 51-year-old celebrity trainer explained that her secret to staying fit while still enjoying the festive season is “practicing balance.”

“One of the ways you can do that is by incorporating what I call the 80-20 rule,” Michaels said.

“It’s notoriously a nutrition rule because it’s so basic and common sense,” she continued. “Anybody can understand it and everybody can do it.”

“The Biggest Loser” star said that the key to implementing the 80/20 rule is to track and manage a “calorie balance.”

“So let’s say you’re a guy, you’re 44 years old, you work out a few times a week and you burn 2,500 calories a day, you’re not trying to lose weight, but you’re trying to gain

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