I have never been a small or particularly slim individual. In fact, to be brutally honest at times in my life i have had the aerodynamic properties of a bungalow and the coordination of an American bombing raid.
I have always put huge effort into running, for example. My arms and legs swing around like the pistons on a frantic steam engine but despite this it would require a theodolite to ascertain that i am actually moving forwards.
This made me a bit of a duffer at school sports.