Try this shoulder stretch this morning. It can help your body relax, which is a great way to start the day. Challenge details: Stand with your feet hip-width apart. Bring your left arm up and across your chest. Hold it to your chest with your right arm for 30 seconds. You can hold it either above or below your elbow. Change arms and repeat. Stress can make your muscles tense up. But stretching can help ease that tension and help trigger your relaxation response.