To begin to develop a horse’s musculature, it’s important to start slowly and take the time to create a solid foundation to build on later. This can be a young or green horse that’s never worked, or it can be a horse that’s had some time off or that is changing disciplines or repairing after incorrect riding.  A big part of this means developing the horse’s topline and carrying power, so that he can carry you comfortably, and to make him a lighter, more comfortable horse to ride. When he carries himself correctly, he will move in a way that is easier on his body, helping preserve his long-term soundness. He will…