And this is Vern Gambettas blog entry about 'get rich quick' programs in training, kinda applys to these jump programs. Training adaptations take time. Three to six week crash programs generally are a waste of time. Crash programs can give some short term results, but you usually end up paying the piper later on. There is no substitute for a well planned long term program that has a balance of all training components distributed throughout the training phases. Balance of the training components and time yield the best and longest lasting results. Unfortunately marketing and hype lead people to believe otherwise. Crash programs do just that, eventually they crash!