Originally Posted by Jesus H Christ

I got it as a gift and would never use it or do it's routine because there is no way you are going to do that workout daily. Is it effective?.. absolutely, but you're doing more harm them good IMO.

If you need to lose a substantial amount of weight, 40lbs or more it's a lifestyle change not a p90x shock to your body change. Although, some of the strength training routines are great and there is lot's of workout routines you can learn from, it's going to be a waste of time in the end.

Why? Most people can not learn to control their food/energy intake and when to cut back after they/you get bored with that routine. Meaning, the p90x workout will cause a significant increase in your metabolism. This will be a shock to your system and I would highly suggest you first visit a doctor and get a basal metabolic rate (BMR) test first.

If I were you I'd first focus on energy/water intake and management before I would ever start a program like that. Routine equals success and there is no way possible you'll be able to sustain a workout like that and in the end you'll get discouraged and gain the weight back with a new fucked up metabolism.