Well New Training System idea was liked by the in-game players at that time, now time to see what you say:
This system will make it more challenging to level up.
There will be Taijutsu but not the way we see it.
The way you level up is gain experience and level up once reached experience needed. Experience needed is multiplied by 0.5 each time, to make it more challenging every level. Believe me it can get CHALLENGING!