Well, I would personally refuse to do any program that:
1. Advertises that you can "get a six pack in XX days!"
2. Is advertised on TV and lists the price as "A $600.00 value for only 3 monthly payments of $39.95 (+$19.95 s&h)"
3. Has a sketchy
website that makes the scam alarm go off in my head
Having said all that, from what I've read & heard, it's not the worst of the late night advertised "get ripped fast!" programs. In fact, many people do get good results with it, although I'm sure the majority get nowhere near a 6 pack. From what I've read & seen of it, I like the following:
* It comes with some sort of diet plan. This lends the program a lot of credibility, as any program that claims to get you "ripped" without mention of diet is full of crap.
* The workouts focus on high intensity and are supposed to be a combination of a number of disciplines, including cardio, "karate", plyometrics, etc. The fact that they aren't selling fancy "gizmos" to get you in shape (e.g. bow-flex, total gym) and instead focusing on full body functional movements at high intensity is great.
Unfortunately, I've also read that the program can get boring pretty fast, it is lacking many important parts of total fitness (such as heavy lifting), and it over-emphasizes isolation exercises (TONS of ab work, bicep curls, etc). However, the biggest killer, IMO, is that the program offers nothing that you can't get for free. I would instead point people to the following resources:
1.
Crossfit: Crossfit workouts are extremely varied (no more than 3 or 4 repeats
per month), are a mixture of olympic lifting, power lifting, plyometrics, running, gymnastics, etc, and are extremely intense. The goal is general fitness across all domains (strength, speed, power, quickness, balance, etc) and the results are incredible. Every workout can be scaled to anyone's level, from small kids to professional athletes to grandmas. CF's website is completely free, lists a new workout daily, and contains hundreds of instructional videos. CF also has a massive online community that is incredibly helpful and supportive. CF emphasizes proper nutrition and usually recommends the Zone and/or Paleo diets. IMO, CF has everything P90X has, but CF does more of it and does it better and offers it for free. The only downside is that to do CF properly, you need a lot of equipment - although a lot can be built cheaply and there are MANY workouts that require none, it's best if you have access to a nice gym.
2.
RossTraining: a free resource for a ton of workouts you can do at home and usually with minimum or super cheap equipment.