What does filming your high jumper from the front show that a side-on clip won't?
Hip rise and takeoff angle come from a side-on clip because they happen forward and back. Drift, a crooked plant and an off-centre landing happen across the body, and a side-on camera cannot see across.
The Film Room's high jump setting is built around a side-on clip, and for good reason: hip rise, takeoff angle and knee fold are all forward-and-back movements, exactly what a camera placed level with the plant and facing across the approach can see cleanly. That same camera has a blind spot, and it is worth knowing what falls into it.
Faults that happen across the body, not along it
- The approach drifting toward or away from the bar in the last few steps, rather than curving the way it was set up to.
- The plant foot landing pointed away from the bar instead of square to it.
- One shoulder or hip arriving ahead of the other at takeoff, so the bar is cleared rotated rather than flat.
- Landing off-centre on the mat, left or right of where the jump should put the athlete.
Every one of those is a side-to-side fault, and a side-on clip genuinely cannot show it, not because the app is not looking closely enough but because the camera is on the wrong axis for it. The plant foot can be pointed in any direction and still look identical from directly beside the runway.
A practical split
Keep the side-on clip as the weekly default, because hip rise and takeoff angle are the numbers worth tracking jump to jump, and they are what the app actually reports. Add a clip from behind the approach, or face-on from beyond the bar, every few weeks, or whenever a jumper is missing in a way that does not show up in the side-on numbers at all. That second angle will not give you a number back. It is there so a coach's own eye can catch the drift or the crooked plant before it becomes the explanation for three missed attempts in a row.
A single 2D camera reads whichever plane it is pointed at and nothing else. The high jump setting's hip rise and takeoff angle come from a side-on frame and describe forward-and-back movement only; a sideways drift, a crooked plant or an off-centre landing needs a different angle filmed on purpose, because no single clip sees both planes at once.
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Related
Can the Film Room tell you how high your jumper actually cleared?
The high jump setting reports hip rise and takeoff angle, not centimetres off the bar, and the reason is worth knowing before you expect the other thing.
Read →Why does my hurdler drift sideways over the hurdle?
A lead leg cutting across the body is usually the cause, and it is also the one hurdles fault a side-on camera cannot actually show you.
Read →Why does your high jumper's plant foot never land in the same spot?
A side-on camera reads the vertical arc of a jump well and has no idea where the plant foot actually landed on the ground, which is usually the real question.
Read →