Would like more separation between hip and takeoff foot (pushing hips more into hurdle, creating a steeper takeoff angle).
Nathalie is casting that takeoff leg out too much. Note the shin angle, split between knees and heel strike. That is a significant "brake" to the speed generated to this point.
Some of the trouble here is set up by casting the takeoff foot out there as seen in the previous pic. While the shin angle on the takeoff leg is OK, there is a break (bend) at the knee, which is putting the upper body too upright.
Pro entry to takeoff. Shin slightly forward as takeoff foot hits the track. Knees even.
Pro takeoff. Great triple extension -- ankle, knee, hip, shoulder. Nice fold in lead leg. Note how far the hip is ahead of the takeoff point. All great hurdlers do this. They set it up properly with the takeoff entry (off heel and nearly under hip as in photo above), then they take an aggressive angle into the hurdle, pushing the hip toward the hurdle with the lead arm, head and lead knee getting out front ahead of the lead foot, which remains folded a while.
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