There is of course such a thing as a natural body type - the traditional big three are Ectomorphs, Endomorphs and Mesomorphs.
Ectomorphs are lean and often tall, and usually find it easy to lose weight. Endomorphs are larger, usually carrying more fat, and Mesomorphs typically gain muscle more easily.
In professional cycling, we're often seeing those already gifted in one direction, push themselves further that way, but there's no reason that amateurs can't also pick and chose their key pursuits based upon their genetic predisposition.
"There are exceptions to the rule, but Ectomorphs will lean towards to aerobic exercise and longer endurance based sports. Mesomorphs and Endomorphs cross over slightly, and will be more suited to strength and power sports." Girling says.
"The Mesomorph is someone who is just athletically built and will perform across the board. You will have them in cycling, some on the track, and some of the heavier Tour de France riders – maybe 80kg [male] riders who are amazing time triallists or can sit on the front and push the pace."