Speaking of "The Biggest Loser" show, most of the participants gain all the weight they lost back within a year and get even heavier. Changes that come through great force and with no respect to the body's current limitations can come fast and can be very impressive, but they are usually unsustainable. They get undone as fast as they were brought about, and then the mind-body system gets thrown back and regresses because it wants to compensate for the lost balance.

Yoga, on the other hand, takes a completely different approach. In yoga you are always instructed to respect your current state and work within your limitations. The body will make a better and a more sustainable progress when its pace is respected. And, mind you, yoga is also an action-oriented approach but it's philosophy is completely different from the big losers. Ask any respectable medical doctor what he thinks of shows like The Big Loser, and he will tell you that training like that one doesn't make anyone healthy, on the contrary, it is very damaging.

As a rule of thumb, any "quick fix" solution is a scam.