By the numbers

The 150-lb person...
Burns 80 calories walking 1 mile
Burns 113 calories running 1 mile
Burns 351 calories running a 5K
Burns 702 calories running a 10K

Burns a pound of fat in 1 week after running a 5K a day
Burns a pound of fat in 1 week after running a 10K every-other-day

Raises her "Good Cholesterol" level by 1 point every 10 miles/week run
Lowers her blood pressure by 12 points just 45 minutes after a 20 min run
Maintains a lowered blood pressure 7 hours later (after just 1 run)

Can reduce depression symptoms by 1/3 after three months of regular exercise