If you are a passionate yoga practitioner, you are probably noticed the benefits of yoga. Maybe you’re sleeping better or getting fewer colds or just feeling more relaxed and at ease. But if you’ve ever tried telling a newbie about the benefits of yoga, you might find that explanations like “It increases the flow of prana” or “It brings energy up your spine” fall on deaf or skeptical ears. As it happens, Western science is starting to provide some concrete clues as to how yoga works to improve health, heal aches and pains, and keep sickness at bay. Once you understand them, you will have even more motivation to step onto your mat, and you probably won’t feel so tongue-tied the next time someone asks you why you spend time on your mat.