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Exercise New research shows exercise need not be done all at once to protect against heart disease. NPR's Richard Knox reports that two15-minute sessions are as good as one 30-minute session.

Exercise

Heard on All Things Considered

Exercise

Audio will be available later today.

New research shows exercise need not be done all at once to protect against heart disease. NPR's Richard Knox reports that two15-minute sessions are as good as one 30-minute session.