You want to know what exercise do for you?

 Lets see:

No. 1: Exercise controls weight
Exercise can help prevent excess weight gain or
help maintain weight loss. When you engage in
physical activity, you burn calories. The more
intense the activity, the more calories you burn.
You don't need to set aside large chunks of
time for exercise to reap weight-loss benefits. If
you can't do an actual workout, get more active
throughout the day in simple ways — by taking
the stairs instead of the elevator or revving up
your household chores.
No. 2: Exercise combats health conditions
and diseases
Worried about heart disease? Hoping to prevent
high blood pressure? No matter what your
current weight, being active boosts high-density
lipoprotein (HDL), or "good," cholesterol and
decreases unhealthy triglycerides. This one-two
punch keeps your blood flowing smoothly, which
decreases your risk of cardiovascular diseases.
In fact, regular physical activity can help you
prevent or manage a wide range of health
problems and concerns, including stroke,
metabolic syndrome, type 2 diabetes,
depression, certain types of cancer, arthritis and
falls.
No. 3: Exercise improves mood
Need an emotional lift? Or need to blow off
some steam after a stressful day? A workout at
the gym or a brisk 30-minute walk can help.
Physical activity stimulates various brain
chemicals that may leave you feeling happier
and more relaxed. You may also feel better
about your appearance and yourself when you
exercise regularly, which can boost your
confidence and improve your self-esteem.
No. 4: Exercise boosts energy
Winded by grocery shopping or household
chores? Regular physical activity can improve
your muscle strength and boost your endurance.
Exercise and physical activity deliver oxygen
and nutrients to your tissues and help your
cardiovascular system work more efficiently.
And when your heart and lungs work more
efficiently, you have more energy to go about
your daily chores.