Answer:
You use it between your head and your toes, the more it works the thinner it grows. What is it?
What instrument plays from the heart?
I am a piece of paper that takes most people 3 or 4 years to get. What am I?
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
Is always in front of you but cannot be seen?
The profession of Jimi Hendrix and Eric Clapton