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Part of the controversy of the man's autobiography relates to a story about how he ran the rule over- and rejected- a player who evetually signed for a rival club.
Part of his analysis was that the player ran with his knees and with a straight back, as opposed to running with his hips - and that this would make him injury prone later in his career.
Is this just another way of describing heel vs midfoot striking or is there something else to it?