TRENTON, N.J. — New Jersey Gov. Chris Christie says undergoing gastric bypass surgery more than a year ago was a “life-changing decision.”

Appearing on his monthly TownSquare Media radio show Wednesday night, Christie says he works out four days a week and has achieved better health.

The 51-year-old governor hasn’t said how many pounds he’s shed, but he has become noticeably thinner since secretly undergoing the surgery last February.

He says he enjoys riding a stationary bike but does not like doing side-lift exercises with dumbbells.