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It is easy to overlook the role that your body 1 in influencing your mood. When you are . 2 you may find yourself blaming work pressures or an unknown future. 3 it could just be that you've been s i tting behind your desk too long. One way to improve your mood is 4 . Psychologically, it provides you with a break from the stresses in your life. Also, in the process, you may aim for 5 goals, like a new personal running record or a better body shape. The achievement of a particular goal makes you feel 6 and contributes to your 7 . That is 8 exercise has been shown to build up your self-respect. Y ou do not have to train yourself 9 to feel the psychological benefits of exer c ise. What really matters 10 frequency, not intensity( 强度 )of your exercise. You can try walking for 30 minutes, five times per week or simply gardening on weekends.