And jogging and bicycling increases your chances to get fatally hit by an automobile, train or plane.
I wondered about that a while back, so I did some investigation into the odds. It turned out that the risk of riding a bike is in the same ballpark as riding in a car when measured on a per-hour basis.
While the risks aren't insignificant, they turned out to be clearly better than the risk of being out of shape and keeling over prematurely from a heart attack or similar problem.
I do avoid some of the things that probably skew the cycling risk numbers higher, such as riding at night, or riding on hilly country roads that lack shoulders.