P90X: The All-Star Workout?

Many celebs use it, but is an hour-a-day fitness routine all it takes to buff?
5:41 | 10/17/11

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Transcript for P90X: The All-Star Workout?
Celebrity endorsements are boon for any work out brand there's nothing like -- star power to. Lure curious customers in the wildly popular fitness program and look at tonight. Has fans in Hollywood but the real true believers can become from the rank and file of American exercises folks whose enthusiasm for this workout can seem. To the uninitiated. A little wound up here's ABC's David Wright. At 6 AM on a Saturday in downtown LA. It looks like it come to Jesus revival what I -- -- out. -- standards. Think of all -- -- this missionary. Doing for the first time in public. What they would normally do all by themselves. -- -- living rooms at home it's the ultimate ninety -- home fitness program a dvd worked out called you ninety's acts now -- worked out of choice for Hollywood a blisters. Including mr. and mrs. Ashton could share. As well as some of the more muscular members of congress. Are very welcome. It's slightly goofy grin. The Tony Robbins of the six that. You get the full ninety days of training for three easy payments of 3995. He could just change your life a -- you in ninety days. -- -- -- 75 miles an office and -- who bombs -- pretty good. Don't let people know -- they don't think what would you guys that we think Tony thank you for -- -- -- I didn't do the work they did the work while it did it ever doesn't build -- house. The signature of the program is one. Here's -- before. -- photos from -- people showing results I'm definitely the before. On -- I don't know about that. Even the CEO of the company as -- before and after. The before and after photo is the visible through. Look there's a trend of obesity in this country I wish we could sell how good it feels to be healthy -- dozens. Move merchandise it doesn't get people moving. The thing that gets him moving as the fact that they're -- better -- -- they're gonna fit in those skinny jeans again they're going to be able to go to the pool take their shirt off and swim without. Hiding without that embarrassment not. Airbrushed and anyway never Photoshop not ever know. 400 million dollar a year business what company has plenty of other workouts familiar to couch potatoes bread adds Brazil but left. Body gospel slim in six. -- -- Turbo -- terrible fire. Ten minute trainer great -- guaranteed fifth dies guaranteed and -- they're really guarantee absolutely. They'd even developed a Christian themed work out. What. Body gospel yet the first faith based. Comprehensive program which of expertise and now it's. Push ups to honor. What I got from god. So far. -- a lasting -- they don't want to be I wanted to be Brad Pitt can carry -- -- -- one. With Tony Horton is the front man -- turns out he's not even a certified trainer. I'm from Martin's that who is important tried to make -- go and act. Acting playing a police detective and a soft core porn movie called Rebecca his secret earn extra money He ended up helping other actors -- -- -- Instead of becoming a movie -- you ended up. Working -- her reading them -- a -- -- you know that led to infomercials He was the guy in Suzanne Somers thigh master. -- Apatow sometimes masterful getting excellent results now with XT's front He -- I'm not working -- And millions of living rooms across the country and what. Tony is great -- is taking. This this highly technical and that you know functional fitness and presenting -- -- that. Literally millions of people love. And millions of people can do without getting injured in any X has been so successful speech by the recently added a new line of shapes and nutritional supplements. -- -- And they -- now enlisting the faithful to go out recruit -- us that's what this recent weekend conference in LA was all about. Teach 1990 actors to make money signing up new. Forgiving that and somebody who has done this deadline and would like to try it. It seemed a little multi. -- -- how -- We the people that are into it are so passionate about it -- and you know we're talking about is sort of not just a fitness program that a life transformation. After and then having the people that have gone through it go out and -- it would just -- -- little hope that. -- -- Well I think it's a perspective that is cynical modeling to go to would -- I want to be by myself and -- -- work out. That's not cold feet and they all work out -- every one of. -- -- -- I don't know I sneak up at night hey you've worked out naked to if you had already achieved your after. I'm David Wright for Nightline in -- --

This transcript has been automatically generated and may not be 100% accurate.

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