Speed - Legs or Arms?

A 17-year old athlete from South Africa, Oscar Pretorius, won the 200m at the Paralympic Games in Athens in a world class time of 21 something - an athlete with NO legs.

I have always believed that speed is in LEGS - with this example, does it mean that speed is in ARMS??!!

If you watch him run, his upper leg mechanics are almost identical to that of an ‘able-bodied’ athlete. As are the arm mechanics. This just goes to show that in order to have fast legs, you need fast arms too.