I saw a couple of dark marks on the veins around my calf and shin. I showed them to a knowledgeable colleague and he says it is some kind of varicose veins, probably due to the low fat high muscle composition of my legs.... This worries me as I am 27, healthy, and have a FTP of about 340w, so I really wouldn't have thought I would be in a position to have anything wrong with my veins..... Anybody know anything about this? For the record - the last year I have been using a protein shake after training and have put on a lot of muscle on my legs - and the veins have become very prominent.