In a new interview with Cosmopolitan, dancer-cum-actress Jenna Dewan Tatum said that she's been dipping her toes in the wide and deep pool of Reiki. "I like to play around. I’ll do it with [our daughter] Evie when she’s getting overwhelmed. She thinks it’s so funny," she explained. "It’s an ancient healing modality from Japan where you tap into a conscious energy conflict. Chan loves it. He gets all the nice side effects of having a hippie wife."As she mentioned, this practice isn't confined to the Dewan-Tatum household — or "hippie wives" for that matter. Reiki and other forms of energy work (including aura readings and crystal gridding) have made their way into the mainstream, thanks in no small part to the " witchy" corners of social media and the general self-care movement.Since Reiki's gotten so much attention recently, we decided it was high time to sit down and determine: Well, wait, what actually is it? Turns out, there's more to it than you'd think. Reiki (pronounced "ray-kay") was created in the late 19th century by a Buddhist monk named Mikao Usui , but didn't come to the Western Hemisphere until the 1970s. It's viewed as somewhat of a cure-all for energetic imbalances (which some believe can cause anything from headaches to chronic pain to anxiety), thus its literal translation from the Japanese: "universal life energy."When we spoke with fitness witch (and Reiki practitioner) Ammo O'Day last summer, she explained how a Reiki healing session, in which someone seeks out a professional, actually works:"When the session happens, I usually ask the client to do some kind of breathing pattern. And I lightly put my hands on different portions of their body, and this helps their body unconsciously heal itself. The energy coming through me is connecting to the client’s body unconsciously to figure out what the problem is and to go to it and unblock it."The client is usually lying down in the healer's space, wearing simple, comfortable clothes (you don't want any jewelry or synthetic fabrics to affect the direction of the energy that the healer's commanding). While O'Day mentioned that she touches her clients, other healers prefer to simply hover their hands over their clients' bodies.O'Day actually referred to Reiki as "energetic Drain-O," which just about sums it up. The idea is that whatever deficiencies or imbalances you may possess in your body can be dissolved and flushed out, so a healthier flow can be restored.If you're wondering if science backs up the claims of Reiki practitioners, you might not be satisfied. Little to no research has been done on whether Reiki actually does anything physical to your body, but one study found that it's an effective method of self-care Another suggested that it might help ease psychological distress and depression.