YOGA is a system. A holistic system of refining the body, the mind and the spirit in unison. Ultimately, it is well-being, peace, and bliss.
Reiki is one of the more widely known forms of healing through direct application of Chi, or a force very similar to Chi for it may be that Chi is different from the energy used by Reiki.
Karma (Sanskrit : Action)
The sum of all human actions, which according to Hinduism and Jainism is passed from one individual existence to the next and determines the nature of the individual's rebirth.
In Buddhism, karma is associated with mental and physical elements passed on in the cycle of rebirth until the personal self is annihilated in attaining nirvana.