updated 10/14/2012 AT 10:00 AM ET
•originally published 10/15/2012 AT 10:45 AM ET
When comedian Jeff Dunham decided he wanted to get in great shape for his wedding, he didn’t have to look too far for help.
That’s because the ventriloquist’s bride, Audrey Murdick, is not only a fitness model, but a certified nutrition consultant and fitness trainer.
For three months leading up to their Friday wedding, Dunham tells PEOPLE that he and Murdick, 32, religiously followed the diet she sticks to when preparing for a National Physique Committee bikini competition: one that s high in protein, low in carbs, moderate in healthy fats and free of gluten, dairy and alcohol.
Dunham, 50, also did cardio six to seven days a week, working up to an hour and 20 minutes a day on a stair climber, plus three days of weight training every week.
The result? He lost 25 lbs. and now weighs what he did in high school.