well, actually it is not possible to master Reiki on one weekend, even though modern western reiki might awake the impression it could. It Lasts years of practice and meditation to even get an idea of what a real reiki master might be. I am on my way to rediscover reiki as a spiritual practice, that once belonged to (and emerged from) esoteric buddhism (Usui Sensei, the founder of modern days reiki was an ordinated monk in tendai tradition). It is not a system of "body work" but of bodhi work - and as such it can be practiced in a way very close to what you call Zen ^^