OMG! This is what your legs look like after Tour De France!

[TexasProgresive]

1. That's not from lactic acid build up.

I'm sure that he has that as well. It is a combination of near zero subcutaneous fat and the massive blood flow to keep those muscles working.

Are Big Veins a Sign of Fitness?
This unbelievable photo of a Tour de France rider's prominent veins will have you wondering if you should be creating your own vascular network
By selene yeager

http://www.bicycling.com/training/are-big-veins-a-sign-of-fitness
snip:

Bora-Hansgrohe rider Pawel Poljanski broke the internet after Instagraming a photo of his "tired legs" following stage 16.

The sprawl of veins punching through his paper-thin skin looked like a host of spiders throwing a web-weaving rave. Heck. Even my mom reposted it asking, "Does this hurt?!" Other slack-jawed observers wondered if such a vascular look was worth aspiring to, or whether Poljanski was simply a freak of nature.

Ah! It's so nice that html is working again at DU.