For example, in the anime it doesn't show, however, his body already has a scar and well-developed muscles,And in vol 17 to say that his muscles due to the freya family (hognir, hedine the Gulivers) trained Bell's body to the natural limit,And also at the end of vol 17 it was said that Bell looked face with freya (she is 1.70 tall), we can see the development too In vol 12 of sworde oratory comparing before