1. Exercise Boosts Brainpower
Not only does exercise improve your body, it helps your mental function.

Exercise increases energy levels and increases serotonin in the brain, which leads to improved mental clarity.

All that makes for a more productive day.

It is clear that those who are active and who exercise are much more productive at work.

2. Movement Melts Away Stress
As much as it may stress you out just to think about exercising, once you actually start working out, you'll experience less stress in every part of your life.

Exercise produces a relaxation response that serves as a positive distraction It also helps elevate your mood and keep depression at bay.
3. Exercise Gives You Energy
You might be surprised at how, say, popping in a workout tape for 30 minutes in the morning can change your whole day. When endorphins are released into your bloodstream during exercise, you feel much more energized the rest of the day.

And when you improve your strength and stamina, it's easier to accomplish everyday tasks like carrying groceries and climbing stairs. This also helps you feel more energetic over the course of the day.

A common excuse  is that I'm too tired to exercise.  While exercise may make you feel more tired at first, that won't last long.

The physical tiredness you feel after working out isn't the same as everyday fatigue, he says. Besides, once your body adjusts to exercise, you'll have more energy than ever.