Now, before you coaches and athletes get mad, I mean no offense and no disrespect.  I love and support all physical and mental sports and activities.  Anything we do, and give it our all, will result in the betterment of the practitioner.  

However, to keep your interest let me give this one opinion here.  I have never heard of a martial artist add baseball to their list of activities in order to better their martial arts.  I have heard of baseball athletes add on martial arts to their list of activities in order to better their baseball.

Let's get into it!