Keep a pair of sneakers in your car or at the office, so you won't have any excuses about exercising. Regular exercise will improve your overall mood and health for the better. If you’re feeling sad or anxious, try exercising, like take a walk, climb a set of stairs, run in place, do a set of jumping jacks, jump rope for a minute, get on the treadmill, or do any type of physical activity. This will help release tension/stress and burn some calories.