LaLanne's publicist, Ariel Hankin, said Tuesday that the 95-year-old underwent the procedure at a Los Angeles hospital on Dec. 8.
Hankin says that before the surgery LaLanne told his family that dying would wreck his image.
The weightlifting guru is doing fine and expected to make a full recovery.
He became famous for his physique and for outrageous stunts, such as towing boats while swimming across Long Beach Harbor handcuffed. He became a household name by hosting an exercise show on television from 1951-85.