Wouldn’t any stimulus which allow the Nervous System to process faster signals than those processed during a given event be considered over-speed? If the stimulus is always GENERAL first and only then specific in its effects as Charlie maintained throughout his training philosophy,shouldn’t we broaden the overspeed method well beyond towing ? If that were the case,then an interesting example and quite successful example of overspeed (general) training may be that of the speedball as used in his training by Allan Wells,maybe worth discussing:
“As the ball moves extremely fast,the brain has to send messages to the muscles much faster than it would during a race and so when the athlete comes to race ,the body has already been conditioned to move at speed. Not only does this help in the preparation for running fast,but it also helps to cut out the injury risk.” (Margot Wells - The Allan Wells Book of Sprinting,1983).
The very same injury prevention effect seems not to be generally present in most overspeed running specific drills,which by definition require much higher level of preparedness,given the forces involved.