The fact is that exercise is all the more necessary during examination time because not only is it a "stress buster "but also has many other health benefits needed to keep fit during examination. As with any a machine to keep in good running condition, it requires maintenance or it will develop problems in various parts or rust due to disuse. Similarly if all our body parts are not moved effectively, as in exercise, the body parts will fail and then you will get physical problems like lack of stamina, excessive sleep, headache, muscle pains, fatigue etc. You will also get mental problems like feeling low or depressed, inability to concentrate, poor memory etc. Various advantages of doing exercise are-
Regular aerobic exercise releases some good chemicals in our body- These make you feel happy.
They counter the effects of stress, depression and anxiety that all students suffer from during examination time.
So after exercising you get a "Natural kick" which is longer lasting and safe unlike drugs or stimulants like caffeine.
It also helps you in weight loss and that will make you feel good about your self.
If opportunity doesn't knock, build a door. - Milton Berle