The benefits of exercise:

Improves health (will limit the innumerables to this one phrase)
Alleviates lethargy
Releases endorphins
Reduces stress
Reduces depression and anxiety
Improves mood
Provides additional regular task
Balances mundane tasks
Provides sense of accomplishment
Engages additional settings
Improves physical appearance
Prevents weight gain
Heightens mental perception
Provides post-exercise relaxation
Improves quality of sleep
Increases metabolism
Improves quality of food and water
Provides additional perspective
Increases molecular turnover rate
Satisfies primal propensity
Increases concentration and focus
Increases non-exercise related efficiency
Improves psychological well-being
Improves quality of sex
Satisfies sense of purpose
Provides entertainment
Increases standard energy level
Increases self-confidence and self-esteem
Provides positive context to clear and arrange thoughts
Decreases desire for caffeine, nicotine, and other drugs