The following pictures are from Dartfish analysis. The pictures are in sequence. The lines are to serve as a guide as to see whether he fully extending his segments. Extending his hip area and legs to gain maximum distance. Very often athletes focusing too much of frequency in the acceleration phase, causing fatique and not covering distance to the optimum.
This pictures shows the fully extended leg on the ground before off ground contact. Although not perfect, this is good enough for the acceleration phase. The 2 lines shows the angle difference of the body from the 1st 3 to 4 steps to the rest of the contacts. However, please take a look at the next picture. This is something i cannot explain...
It could be the tightness of the hipflexor, that he is unable to extend his hip area. From physiotherapist point of view, it is due to the weakness of the core muscle that he is unable to activate his core as much and therefore activated his hipflexor instead. Or, it could just be that he was too eager to go for the next step.
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