Bonus Room

I've been hiding a secret.  We have an extra room, unattached to the house.  The previous owners used it as a gym, which is our plan for it right now.  

It has no windows, which creeps me out a little.  I've been thinking about putting a small window across the top, or next to the door.  

It needs some work; new paint, new lighting, and new flooring.  It smells a little musty too.  But it's a nice bonus room.