Linda Duff

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For a second endurance goal, you should be able to do high-endurance aerobics for an hour (that’s a serious clip where you can no longer talk, other than a few panted words; it’s 70–85 percent of your maximum heart rate). If you can maintain this pace for two hours, that’s wonderful.
Younger Next Year for Women: Live Strong, Fit, and Sexy - Until You're 80 and Beyond
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