Being involved in activities other than baseball

I’d like to start a discussion on whether being in other sports,
playing a musical instrument, or being involved in various clubs, etc.
can help or hinder a baseball player who truly wants to succeed.

Thoughts and opinions anyone?

Or even,
when a baseball player is involved in other activites that hinder his baseball practice times, etc.,
should he/she continue to be involved in those other activites?