When you work out, the pleasure centers in your brain are flooded with endorphins and dopamine, the “happy hormones” that make you feel the way Dwayne Johnson always looks: relaxed, strong, confident, intelligent. Brain opioids are so powerful that if you exercise, you can lower your “mental health burden” by nearly 25 percent and enjoy a much higher ratio of positive mental health days—a whopping 43 percent—than non-exercisers experience.
