Originally Posted by ed073

Okay....let me help you.

All elite runners and cyclists are incredibly lean. This helps with muscle definition/vascularity and may make musculature more apparent or appear larger.

Sprinters on the track and velodrome combine a lot of weight training with their sport-specific training. This is why Maurice Green has massive thighs/chest etc and Florian Rousseau has freakish legs.

Endurance runners and cyclists at elite level do little or no resistance training. Hence the wasted upper body look and stick legs. Increased muscular cross-section is detrimental to performance in endurance sports.....I'm happy to explain why if you want.