We know that the world is stressful these days, but exercise is a sensible way to minimize its negative effects.

Healthy Lifestyle Tip: Exercise = less stress
Physical activity can take your mind off of your problems by redirecting your thoughts to the activity at hand. Any form of physical activity can help you unwind and can become an important part of your approach to easing stress. The same regular exercise routine that helps prevent disease and builds muscle can also help you better manage stress.

How does exercise reduce stress?

• It pumps up your endorphins. Physical activity helps to bump up the production of your brain's feel-good neurotransmitters, called endorphins. Although this function is often referred to as a runner's high, other activity can also contribute to this same feeling.
  
  
• It's meditation in movement. After exercising you may find that you've forgotten the day's dilemmas and irritations because you are concentrated only on your body's movements. As you begin to regularly shed your daily tensions through movement and physical activity, you may find that this focus on a single task, and the resulting energy and optimism, can help you remain calm and clear in everything that you do.
  
  
• It improves your mood. Regular exercise can increase self-confidence and lower the symptoms associated with mild depression and anxiety. This can ease your stress levels and give you a sense of command over your body and your life.
  
  
• It has social benefits. Most often physical activity involves others and gives you a double dose of stress-relief with the combined benefits of exercise and fun with friends.

Source: MayoClinic.com