I disagree. If you want to get into something badly enough, you will. If you don't want to, you will play the size card, or any other excuse you can think of.
In NW FF1600 we have drivers of all shapes and sizes upto 6ft 5ins and 19.5 stones [124 kg]
I am reminded of a friends description of the difference between open and closed wheel racers [he is both a sailor and a car racer]. "the single seater racer would use a proper wooden boat. Those mamby pamby fibreglass boats are for saloon racers" Nuff said.