Walk for 3 minutes at 4.0; run at 7.0 for 90 seconds; then sprint at 9.5 for 30 seconds -- repeat until you have completed 30 minutes (should be close to 4 miles!) -- then jog for 3 minutes to cool-down. --Love marathoner Kara Goucher!!

Calorie-Burning Cardio Workout

Walk for 3 minutes at 4.0; run at 7.0 for 90 seconds; then sprint at 9.5 for 30 seconds -- repeat until you have completed 30 minutes (should be close to 4 miles!) -- then jog for 3 minutes to cool-down. --Love marathoner Kara Goucher!!

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