Meditation and mental training forms part of any good martial art's syllabus.
With meditation also comes related exercises like Qigong.
It is important to note that visualisation exercises and qigong are meant for the dojo alone and can be fatal to the practicioner if he takes this into the street. This is because the outside environment requires us to be aware thereof and pre-occupation with one's own internal workings is sure to leave you open to surprises.
Awareness of self causes resistance within us and delays our responses. Only when awareness of self has been eliminated can the fighter truly utilise his training.