To unlock taijutsu Naruto you must talk to guy sensei and he will tell you to buy one of his siuts he will not tell you were it is but it is in Tanzaku Town talk to the merchant hiding behid the shed and buy the suit for 100,000 Ryo then go back and talk to him. he will say to find his secret training spot whish is on the outskirts of a certain place well then you start out the training by doing Guy senseis poses then you have to battle fight him 2 times but be careful because his attack will be stregthed and your defense will be lowerd.