But if you are looking for a reason to get out of bed, the latest research from the Copenhagen City Heart study found that only one to two and a half hours of jogging each week (15 to 20 minutes, four times per week) at a 'slow or average' pace is enough to increase life expectancy by 6.2 years for men and 5.6 years for women.  

Furthermore, the results showed a U shaped curve in the relationship between time spent exercising and mortality.  Test subjects who reported moderate amounts of jogging lived longer than those who did not jog at all and those who were avid joggers.