Over 20 years ago computerized hydraulic isokinetic training equipment was introduced. This equipment could, for the first time, apply variable resistance training at the same high speeds used in performance. Even though isokinetic equipment driven by air and motorized resistance was already available, the hydraulic valve model allowed for faster speeds and significant improvement in rehabilitation and training results. However, the hydraulic model relied on a computer, and computers at that time were too large and too expensive.
As the personal computers evolved, several unsuccessful attempts were made during the 1980’s to mass market this equipment to physical therapist and other rehabilitation specialist. These attempts failed primarily because the market was not properly defined. Although clinically the results shown by the hydraulic equipment were superior, the market efforts of the motorized equipment were limited to hospitals and professional sports centers. The marketing emphasis of this product was placed on rehabilitation of sports injuries and very little was known regarding the sports performance training applications.