Handicap differentials are a feature of many handicapping systems. Zahavi borrowed the term "handicap principle" from sports handicapping systems. He earned a reputation as an expert in sports handicapping, particularly for football. Contrarily, horse race handicapping is implemented using extra weight. It has been used for handicapping contests as well as handicapping seminars. Sportsboats at first raced in existing class divisions under existing handicapping systems. Lifespans may be normal, albeit with severe physical handicapping. This can be positioned to affect handling or used as a form of handicapping.