s patent application ser no 09 295 913 entitled u201c system for optimization of golf clubs u201d tempo is usually identified with swing speed one useful measure is the speed of the golfer 39 s hands which for purposes of standardization could be measured at the left middle knuckle for a right handed golfer or at some other convenient reference point observed at the point of impact of the golf club and golf ball several devices for measuring club head speed already exist and these can be easily modified to measure hand speed e g by placing an indicator on the left middle knuckle that is picked up by a sensor at the point of impact see for example u s pat no 4 059 270 to sayers tempo could also be measured with a stopwatch by analyzing videotape of a swing or even by how fast or slow the swing felt to the golfer ball striking accuracy can be measured using impact tape as the dispersion of hits on the face of a club head by analyzing golf club and ball impacts from video tape or by subjectively analyzing how the impact felt to the golfer i e did it feel solid was it a toe or heel hit etc referring now to the figures of the drawing the figures constitute a part of this specification and illustrate exemplary embodiments to the invention it is to be understood that in some instances various aspects of the invention may be shown exaggerated or enlarged to facilitate an understanding of the invention 0021 fig1 is a representative three dimensional graph of tempo as a function of both length and weight according to one embodiment of the invention in general tempo decreases as length and weight of a.