Is 30 Minutes of Exercise a Day Enough?

Science says you may need less exercise than you think to live a long and healthy life.

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Phys Ed

Science says you may need less exercise than you think to live a long and healthy life.

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By Gretchen Reynolds

For anyone interested in the relationship between exercise and living longer, one of the most pressing questions is how much we really need to stay healthy. Is 30 minutes a day enough? Can we get by with less? Do we have to exercise all in one session, or can we spread it throughout the day? And when we’re talking about exercise, does it have to be hard to count?