@cameronperformance: There is no guess work. My specific calculations work seamlessly with improving spiking sequence deficits (different from spike timing) for total spike improvements. Then my drills work to improve the specific areas. These are key for knowing what to work on and not waste time. Specific drills I created for spike timing and spiking power are in my Spike and Vertical System (bio) #volleyball #volleyballtraining #vball #volleyballplayer #volleyballscience