I have always been aware that I am a lousy runner ( although I am a lot better now -- who would have ever thought that I could run for 25 minutes non-stop, soon to be 30 minutes on Saturday -- it has taken me 67 years to do it!!! )
But look at this video
this is what I now need to concentrate on. My running (and walking ) form. This runner has long legs and hasn't got an ounce of fat on him - but his form is what we can all aspire to. Big long strides which culminate in his foot landing immediately below his body. This will require good cardiac fitness but it is doable even by people like me who suffer from Duck's Disease.