Abstract: The method of design of a golf club with a hosel reinforcement bridge is disclosed. This reinforcement bridge helps stabilize the golf club at impact; preventing miss hits from the twisting of the club head.

Abstract: Athletic performance is enhanced based on methods and articles for customizing the mass addition characteristics of garments as appropriate to the desired athletic performance benefits sought. The enhancements can be explained and implemented by the analysis of specific components of balance associated with the body structure of the athlete. The customized mass addition may be achieved by a carrier mateable or insertable with the garment, or by integral manufacture of mass addition garments whose effectiveness is based on components of balance principles.

Abstract: Athletic performance is enhanced based on methods and articles for customizing the mass distribution of footwear and handwear, as appropriate to the athletic movements involved. The enhancements of such performance can be explained and implemented by analysis of leverage points associated with the musculature of the athlete. The customized mass distribution may be achieved by a carrier mateable or insertable with the footwear or handwear, or by integral manufacture of footwear or handwear whose effectiveness is based on leverage point principles.