Do You Know Of Any Other Activity That Uses 90% Of The Brain?

Jan here (from the PWA team).  Another fun-fact!:  

Frank Wilson is a neurologist famous for his work on our hand usage can shape our brains. Dr. Wilson's interest in skilled hand movements led him to the art of music-making, and there his research found that playing a musical instrument uses approximately 90 percent of the brain, more than any other single activity ever found.

Do you know of any other activity that uses 90% of the brain?