In my internet wanderings today I came across this interesting blog complete with video of Priscah Jeptoo. It's an interesting view on aspects of running form.

It's interesting to watch how different the form is between the top 3 finishers. The second one by far has the tidiest form. Third place has all her stride out in front with what some would call insufficient hip extension at push-off. Just goes to show that form isn't everything!