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Should a high jumper run a J-curve or a straight approach?

The curve does part of the takeoff's job before the athlete ever leaves the ground, and a straight approach is easier to teach a beginner who has not earned that yet.

It is one of the first decisions a new high jump coach has to make, usually in the first week: teach the run straight at the bar, or teach the curve from day one.

What the curve is actually buying

Running the last three to five steps on a curve leans the body away from the bar before the plant ever happens. That lean is what lets the athlete plant against the ground rather than beside it, and it is most of what sets up the rotation and the backward layout the flop needs once the athlete is in the air. A straight approach has none of that lean to work with, so whatever rotation the jump needs has to be manufactured at the plant alone, with the arms and a very short window, which is a harder trick to teach and an easier one to get wrong under pressure.

Why anybody still starts straight

• A brand new jumper is still learning to find a consistent takeoff foot and a tall posture at the board. Adding a curve on top of that is two new skills at once instead of one.
• An athlete who has not yet learned to land on their back, and is not yet comfortable with the mat, can scissor over a low bar straight-on without needing the flop's landing at all.
• An approach that keeps falling apart in the last three steps is sometimes an athlete attempting a curve nobody actually taught them. Straightening the run out for a session or two while the curve is rebuilt in isolation, with short, no-bar curve runs, is often the fastest way back to a working approach.

For anyone jumping the flop competitively, though, the curve is not optional. It is where most of the height actually comes from, and a jumper stuck running straight at a bar they are trying to flop over is working against the technique rather than with it.

What the Film Room can help decide, and what it cannot

The high jump setting reports hip rise as a share of body height, takeoff angle, and knee fold and extension, whichever approach shape produced them. What it does not do is see the approach itself. The curve happens off to the side of the plant, mostly out of the frame a side-on camera is filming, so the analysis reads the outcome of the run rather than its shape. A flat hip rise after a straight approach and a flat hip rise after a curved one look identical on the report. Only the coach standing in the infield, watching the whole run rather than the last step, knows which one it was.

One camera positioned at the plant cannot see the curve at all. Judging whether the arc itself is right, too tight, too late, leaning the wrong way, needs a view of the full run-up from the infield or above, not a clip framed on the bar.

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