Write fromthe jump.Not around it.

Here is the mechanical reason. When you plant, the pole stores the energy you brought down the runway. It gives that energy back on recoil — but only along the line your body is on at the moment it straightens. If your torso is at 60 degrees when the pole starts to return, most of that stored energy pushes you sideways and out, not up. Finish to 170 degrees and the same pole, the same speed, the same grip sends you straight up the line of the pole. Same input, dramatically different output.

This is why an athlete can add a full foot per second on the runway and see nothing on the bar. In one session we measured, three separate jumps shared the fastest approach of the day, 27.7 ft/s — the exact same speed, the exact same runway. One stalled at 52 degrees of inversion. One reached 140. One finished the rock-back at 170. Same fitness, same speed, three different outcomes. The best jump of that session was not even the fastest one — it was 27.4 ft/s, a hair off the top, but it finished to 169 degrees and pushed 8 feet 3 inches above the grip. The variable that separated those jumps was never speed. It was timing.

The practical takeaway: before you spend an off-season adding speed, find out what percentage of your jumps actually finish. If it is under half, you are leaving height on the runway that no amount of extra speed will collect.

The symptoms are recognizable even without measurement. You feel the pole stop you rather than carry you. Your top arm collapses because the pole is loading before your body has left the ground. The swing feels late and heavy. You blame the pole and go stiffer, which makes it worse. Coaches call this jumping into the pole, and the standard cue — move your step back — is correct but useless without knowing how far back.

The fix is a number, not a feeling. If you know you are five inches under, you move the standard back five inches and re-measure. If you are two inches free and losing pole bend, you know to leave the step alone and look at grip instead. Guessing costs you a season; measuring costs you one jump.

The one thing worth internalizing: under is not a strength problem or a courage problem. It is a step-mark arithmetic problem, and arithmetic problems have exact answers.

But a lesson is a snapshot. You get an hour every week or two, and every jump you take in between is unobserved. That is where technique quietly drifts. You feel good about a session, you go home, and three weeks later your step is six inches off and nobody caught it because nobody was watching those particular fifty jumps.

The gap is not coaching quality. It is coverage. A vaulter who takes 400 jumps a season and gets 20 of them looked at closely is running on 5 percent feedback. The other 95 percent is memory and vibes. Measurement fills the gap between lessons — not by replacing the coach, but by handing them a season of data instead of a season of anecdotes when you do sit down together.