Hi learning, I've done a course to achieve 'level 1 attunement'. I took the course because I was curious, it was only two-days long, it was local and relatively cheap, and I have a friend who was very keen to go but not keen enough to go alone.
Here's what I was told: Put very simply, Reiki is considered to be a healing art. The Reiki 'practitioner' is an 'instrument' trained and 'attuned' to detect (through the hands) blockages/disturbances in energy in the body and release this, and I think there's some 'channelling of energy' into the 'client' too
I enjoyed the course and met some new people, and there were some interesting group dynamics over the weekend. I did experience various things - sensory experiences like fluctuations in temperature in my hands - that were described as Reiki 'phenomena' but for which there are explanations that I find much more convincing. So, I remain sceptical - there was no real 'training' per se, and no requirement to demonstrate any competency, and achieving the 'attunement' is done by a Reiki Master performing a ritual through which you keep your eyes closed.
I do know of people who find the giving and receiving of Reiki a great comfort. I haven't bothered with it since the course.
Nosy question after reading the dna-activation thread - what are you looking for?