I will be showing a 4 year old 1/2 Arab 1/2 QH gelding in Halter and undersaddle classes this year, but he has a pencil thin neck. Because muscle would help to improve the look and function of it, I would like to do exercises to help the process, but I don't know how to build muscle besides correct riding. (Long and Low, and I'm not sure he's ready to work on that just yet because he only has about 2 months undersaddle.) Help? I have a good picture of his neck, but it's from when he was shown in halter as a yearling. I also heard that the neck is one of the last parts of the horse's body to mature; is that true? Picture: Thank you for all your help!