Stress is often thought of as something that happens to us. However, stress is a response to an event and therefore mostly within our control. A major study found that when people view unpleasant physical sensations, like a racing heart and nervousness, as helpful instead of harmful, the risk of heart disease, stroke, and early death diminishes greatly. How can we change our mind about stress? By intentionally subjecting ourselves to a healthy stressor. Fifteen minutes of intense exercise releases endorphins – our body’s natural pain killers and stress fighters – which helps us associate a positive feeling with stress-inducing events.