完成下列下列各题：

It is easy to overlook the rolethat your body plays in influencing your mood（情绪）.when you are   49  ,you may find yourself blaming work pressures or an unknown future.However,it could just be that you’ve been sitting behind you desk too long.

One way to improve your mood is   50  .Psychologically,it provides you with a break from the stresses in your life .Also,in the process,you may aim for    51  goals,like a mew personal running record or a better body shape.The achievement of a particular goal makes you feel good and contributes to your    52  .That is why exercise has been shown to    53  your self-respect.

You do not have to train yourself     54  to feel the psychological benefits of exercise.What really matters is    55  ,not intensity（强度）of your exercise.You can try walking for 30 minutes five times per week or simply gardening on weekends.