Long jump fouls are not a luck problem. They are an approach consistency problem. Below: the four reasons your foot lands over the board, in order of frequency, and the drill that fixes each. Most jumpers have one of these; a few have two.
If you're scrubbing or stepping over by 1-3 feet inconsistently, your approach length isn't dialed in. Re-measure: mark stride 1, then sprint and mark where you actually take off. Adjust until takeoff lands on the board for 6 of 6 reps.
Approach is fine through stride 17, then the last 3 shorten or lengthen as you sight the board. The fix: practice the last 6 strides isolated, without a board, so they're locked regardless.
Looking at the board late in the approach changes your stride length. Pick a spot 10 feet past the board to fix the eye line through takeoff.
Most foulers don't realize which of the four causes is theirs. Film 3 approach runs side-on, AI marks stride length on each, identifies which stride is varying. Fix the right cause, foul rate drops fast.
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