A Professional Cyclist's Leg

I would guess that his varicose veins are more visible because he has little body fat and very well developed legs.

No, consistent athletic effort does not produce this. A medical condition causes this. Ridiculous writing does not improve a blog.

For very long races, cyclists grow a second brain in the legs to use it as an automatic pilot.

Whenever I see a public disagreement I do my own dialectic method of discovery on it. I found an interesting discussion between a Doctor specializing in vascular diseases and a hydraulic engineer. Apparently the valves in the leg veins are failed-open which results in too much back-pressure which forces the veins down the leg. It is generally a congenital condition and not linked to cycling or other forms of exercise. However, increased vasculation could hypothetically exacerbate varicose veins.

I may be wrong on a few or all points; it is not the gospel truth as far as I know. But what I discovered.

BLEH gross!
An uncle of mine had bad varicose veins but it never looked like this and was never that compact. Just looks.... bleh.