You know the feeling. In your head, it’s like a jackhammer. In your chest, it’s like a vice. In your stomach, it’s like a lead weight. It’s stress.

Stress costs the American economy about $300 billion a year in medical bills and missed work, according to the World Health Organization. Headlines call stress an epidemic, and nearly every day we learn more about how it’s hurting us: It makes us eat too much, sleep too little, lash out, get sick, and falter at work and school.