By side to side handspeed I do not mean sidearm.....you do not want your hand coming around the ball....in order to throw all pitches forward armspeed is needed....if you don't have it you cannot throw FB's(sinkers in particular), CB's (it will flatten them out), SL's (cutters, slurves, you stay behind these pitches) and CH's (w/ side to side hand speed you can't sink the ball because you tend to come around the ball).....(submarine guys are another topic)....