I've been searching the web recently for credible information on exercise and fitness. I'm amazed at the huge number of programs promising dramatic results in as little as 15 days. I'm a certified personal trainer, fitness author, and competitive natural bodybuilder and I know better than to subscribe to one of these programs, but the general public does not.
While achieving dramatic results from your fitness program in a short period of time is possible, the probability of sustaining your results for the long-term is very unlikely. It takes me 16 weeks of intense exercise and very strict dieting to get ready to compete in a bodybuilding competition, and I cannot sustain that peak physical condition for very long. So, buying into those quick fix programs is a waist of your money, because you can't keep up the effort it takes to sustain the results for the long-term.
Staying healthy and fit is a lifetime effort which is most easily accomplished through a positive mental attitude, balance and moderation in your diet, and a fitness program consisting of strength training and cardiovascular exercise. The quick fix approach is just a short-term answer to a long-term problem.