Don't be put off by talk of Chakras and coccyx etc., even if you're skeptical of that philosophy, meditation is revitalizing. It helps you relax and release stress. By "unclenching" your muscles and breathing deeply, blood carrying oxygen flows more freely into your muscles, your blood pressure can drop and and your aches and pains can lessen. I'm not sure how the mental rejuvenation works, but I know I feel rested after just a few minutes of quasi-meditation. I say quasi, because I don't officially meditate, I just have a "relaxation" period (relaxing, deep breathing, silent mantra) before yoga and karate that sure feels like meditating.