Healthy, low-risk people derive tremendous benefits from moderate physical activity. A study of 13,000 runners found those in the lowest quintile (fewer than 6 miles or less than 52 minutes per week) experienced the greatest reductions in total mortality (30% less) and cardiovascular mortality (45% less). It did not have to be fast: a few miles at a moderate to slow pace yielded maximal benefits!
PositiveTip: The best exercise is the one you will do regularly! Just do something: walking, moderate running, swimming.