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Moses Mosop–Slow Motion Running Form from the 2012 Rotterdam Marathon

Below is a video shot by Jacky Ledeboer, a phsyiotherapist from the Netherlands, showing the running form of elite Kenyan marathoner Moses Mosop at the 2012 Rotterdam Marathon. The video, posted on her YouTube channel, is shot at 210 frames per second. Mosop will be one of the three men representing Kenya in the marathon at the Olympic Games in London this summer.

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About Peter Larson

This post was authored by Peter Larson. Pete is a biology teacher, track/soccer coach, and dad (x3) with a passion for running, soccer, and science. If you'd like to learn a little bit more about who I am and what I do, click here, or visit


  1. Ignoring the legs for a moment, look at his arms. For all we hear from the form guys about keeping the elbow at 90 degrees, he holds his arms remarkably high. This seems to be a common thing for many (not all, obviously, but many) African marathoners.

  2. Daniel Elenius says:

    Amazing – it looks like he’s not completely putting his heels down! Especially on the right foot.

  3. Sergio Souza says:

    It seems like a perfect beautiful stride, if we can say that, to me.

  4. Seems like the way he “springs” off one foot allows him to land as he does while keeping the landing foot out in front of him.

  5. Katherine says:

    Running is amazing!


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