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.
Copyright 2000 NPR
NHPR is nonprofit and independent. We rely on readers like you to support the local, national, and international coverage on this website. Your support makes this news available to everyone.
Give today. A monthly donation of $5 makes a real difference.