Lifespan and Exercise

Physical activity, such as a brisk walk, reduces mortality.
 
Here are some stats on lifespan and exercise:
 
Having a normal weight but being inactive:  -3.1 years.
 
Having a normal weight and being active:  +7.2 years.
 
Walking at least 150 minutes a week:  +3.4-4.5 years.
 
Even low amounts of activity, such as 75 minutes of walking a week, adds 1.8 years.
 
Bottom line: maintaining a normal weight and being active adds the most years to your life, but even some activity is better than none.