Allison Jones

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DAY 4—HIGH-IMPACT CARDIO Note: Don’t forget to warm up on your cardio days! Choose your favorite form of high-impact cardio. Examples: HIIT class, sprint intervals, running, StairMaster, boxing. High-intensity cardio entails working at 70 to 80 percent of your max heart rate. Either choose one of the activities above or calculate your heart-rate range using this formula: 220 – your age = general guideline for max heart rate. Then multiply that number times the percentage of the target heart-rate zone.
Forever Strong: A New, Science-Based Strategy for Aging Well
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