How much cardio exercise should I do?

In addition to 30 minutes of daily walking, aim for a minimum of 60 minutes a week of cardiovascular or sweating activity—ideally in three 20-minute sessions—in which you raise your heart rate to 80 percent or more of its age-adjusted maximum (220 minus your age) for an extended period of time. I recommend low-impact activities like swimming, cycling, or using an elliptical trainer to get your heart rate up without compromising the quality of your joints in the process (and to change activities, so you don't get repetitive use injuries from doing the same activity over and over).

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