K.Mcphee...Everybody has a range of motion with their arm, from the elbow down. When you swing your forearm from the elbow down only (no involvement of the shoulder), your grip hand will "finish" against your chest, near your armpit. This allows your body to stop the cue, as opposed to 'clutching' the cue and stopping the forward movement arbitrarily. This allows (along with a loose grip) the weight of the cue and timing, to create the strokespeed...as opposed to using muscle/power.