Slightly off topic, but I recently started Kickboxing, and I finally have the impression that I start to understand the connection between martial arts/combat sports and spirituality as it is emphasized in e.g. Bruce Lee's movies. There is a strange wisdom operating in channeling rage to make a technique more effective while respecting (or even caring for) your opponent/partner. I tried Aikido in the past, in search for this kind of wisdom, even selecting a club of a mostly "spiritual" tradition, and did not find it in the few trainings I did - but started seeing it after one session of heavy bag training. There is something about training for actual fight (which I now aim for, at my own surprise) that shifts one view of oneself and others in surprisingly useful ways. I can only recommend trying this kind of sports, if one is interested but puzzled at the strange dialogues in Kung Fu movies.