From the outside, meditation can look passive. You’re sitting still with your eyes closed, taking deep breaths. But anyone who has spent time meditating knows how active, and how intentional, it can be. In the stillness, your heart rate slows and your levels of cortisol — the hormone associated with stress — drop. A regular practice can help with depression, chronic pain, anxiety and sleep issues. It’s sort of like stretching, but for your mind.