Why does my hurdler's trail leg knee swing out to the side?
A trail leg that sweeps around the hip instead of folding under it costs width and time at every single hurdle, and it rarely starts with the trail leg itself.
A good trail leg folds tight, heel close to the hip, then drives back through low and close to the body before it plants for the next stride. When it swings out wide instead, tracing an arc around the side of the body rather than a straight line underneath it, the hurdler loses width on every single clearance and the stride after it starts from a worse position.
Where it usually comes from
- Limited hip mobility. The thigh cannot rotate forward without the knee swinging out first to find room, the same way a stiff door swings wider before it will close.
- A hurdler who has clipped a barrier recently and started giving it extra clearance by throwing the leg around instead of over.
- Rushing the recovery before the lead leg has actually landed, which forces the trail leg around the outside because there is no clean path underneath yet.
The third one is the easiest to miss, because it looks like a trail leg problem from the side when the actual timing fault is happening one beat earlier, in how fast the lead leg comes down.
Why this is the hardest fault in hurdling to coach from one clip
The trail leg sweep happens across the body, not along it, and a camera set up side-on for the rest of the hurdle picture, the trunk dip, the lead leg extension, the hip rise, is looking at exactly the wrong plane for this one fault. From the side, a wide trail leg and a tight one can look almost identical, because the difference is in how far the knee travels toward the camera or away from it, and a single flat image cannot show depth.
What actually shows it
Filming the same hurdle from directly behind, even for one rep, usually settles the argument a dozen side-on clips cannot. If the knee is visibly sweeping wide rather than tracking a straight line under the hip, that is the view that proves it.
StatLap's hurdles analysis reports the lead leg and the hip rise at the barrier from a side-on clip, because those are the numbers a side view can actually measure. The trail leg's path across the body is the one thing a single camera at the side of the track was never going to see, no matter how good the clip is.
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Related
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 your hurdler's lead arm collapses across their body
The lead arm is meant to punch straight at the lead foot, and when it swings across instead the next stride pays for it.
Read →Why does my hurdler land so far past the hurdle?
A long landing burns a stride before the next push even starts, and it is usually decided in the air, not at the ground.
Read →Try it: Hurdle technique analysis from video: trunk dip, lead leg, hip rise