1. regular exercise gets you away from the home or office and away from stress.
2.regular exercise gives you better mental discipline so your better able to ignore stress.
3. people who regularly exercise are happy people and are fun to be around.
4. regular exercise has been shown to reduce the physical effects of stress.
Yes exercise could truly help reduce mental stress.
Here's an article: http://healthmad.com/mental-health/seven-basic-ways-to-minimize-school-stress/