I swear I always had very muscular calves and I was convinced it is genetics and that there is nothing to do about it but I have found the solution: lose weight, stop building muscles(=no cycling only sports that do not involve legs too much, e.g. dancing is great and most important: stretching it is unbelievable but it has done wonders to my calves. I now have very skinny calves due to stretching twice a day for about 15 min. I recommend trying this it worked for me!