I was browsing around the web today when I 'accidently' ran across an excellent collection of resources which carefully examine whether or not studing the martial arts is appropriate for a Christian at http://www.pastornet.net.au/response/ . If you carefully read what is given, it is rich in teaching how to discern the snares of eastern mysticism. It is easily applied to excercising discernment in general.
You can read this editor's personal views at http://www.pastornet.net.au/response/articles/109.htm . In the search for a Christian martial arts instructor compatable with his faith, his earnest effort reminds me of searches I've had to make when facing choices in my own life concerning of traditions & expectations vs. my faith in Christ.
Woe to those on His left on that Day. They will be cast into the fire. ~ God [Letters from God and His Christ - Volume 1 - Those Whom the Lord Has Cleansed Are Now Clean Now Now, and Worthy of the Kingdom]