My B,F is about 9-10% at the moment and TTB is more shredded than I am.I would say he is around 6-7% but certainly not 4.1%.

Mike is correct calves can become bigger through training.Ever see the size of calves on cyclists? my mate does sprint cycling and his are huge they were never like that before he started.What about pro BB they all have good calves but what you are indicating is that they ALL have good genetics on their calves.

The calves are made up of three seperate heads and all 3 can be worked out by positioning the foot at different angles.They are a dense muscle rather like triceps and have the same fibres as triceps therefore they can be increased in size.If it was down to genetics not all the pro BB would have great calves would they?