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Check it off the list. Checkmark systems are for coaching long jump, not competing in the long jump. Coaches may want to put a checkmark four steps back of the board next to the long jump runway. This checkmark allows the coach to see where the long jumper is in relation to where they should be prior to the transition or preparation phase.
This can tell a long jump coach more than the athlete's location on or near the board because the coach will be able to tell by looking at the athlete compared to the checkmark and the board as the whether or not the athlete slowed down a the end of the run, a common and most detrimental error when long jumping.