A guy at work said Vai is a martial artist but doesn't what style or rank. I've never heard anything about this. Has anyone else?
I think they might be confusing with the fact that Steve Vai battled the Karate Kid in the movie Crossroads before... because nothing is showing Vai as a martial artist.
There are a few great musicians who practice martial arts. I can't find any reference to Steve Vai as a martial artist.

Dave Mustaine holds black belts in Taekwondo WTF and Ukidokan Karate. He studies under one the most bad ass full contact fighters of the 70's Benny "The Jet" Urquidez. In 2007, he was made a Goodwill Ambassador of the World by the World Taekwondo Federation.

Elvis Presley was ranked as a Master in Kenpo under Grandmaster Ed Parker.

David Lee Roth has trained for many years in Kung Fu and Brazilian Ju-Jitsu under several famous Masters.

Willie Nelson has a 5th degree in Gong Kwong Yu Su which is a Koraen martial artthat features a mix of Hapkido and Ju-jitsu. He also has a Black Belt in Tae Kwon Do.

Riki Rockett (Poison) has a Black Belt in Brazilian Ju-Jitsu.

I'm sure there are a number of others.
Yes I am guitarded also, nice to meet you.
Last edited by Rickholly74 at Jan 31, 2016,
Victor Wooten's also an outspoken martial artist. I don't know what he practices or his rank,
but he speaks about it as another way of learning control and balance.