A violin. I chose this because music is a very big part in my life, as I have been playing since I was six. Playing music is an excellent stress-reliever and a way to interact with people. However, I haven't been improving as much as I want, so I want to try and practice for about 25 minutes each day.
This FREE cheat sheet is great to print out and hand to beginning string students: violin, viola, cello, and bass. I asked my students to keep this in their music folder so that they can reference it during rehearsal and when they're practicing at home.