1) Cardio workout. Reduces risk of heart attack, disease and some cancers.
2) Lung workout. Reduces the risk of lung disease and cancer.
3) Stress release. Reduces the risk of heart disease, cholesteral build up, high blood pressure and tension
4) Circulatory workout. Reduces the risk of bone marrow cancer, joint problems, diabetes and bladder problems.
5) Fat burner. Reduces body mass index and can build muscle, lose weight. After smoking the single biggest cause for disease of every major organ.
6) Makes you feel good.
7) See the countryside/makes you leave the house.
8) Social, if running in a group or part of a club
9) Free, compared to high gym prices
10) Self progressive. You can easily monitor you own performance, whther time or distance.
Need I go on?