If the walking elevates your heartrate into the cardio zone for at least 10 minutes at a time, then I'd track it as exercise. If not, then I'd just consider it a bonus to your workouts and wouldn't track it.
Hope that helps,
Fitness Minutes: (14,252)
9,689 4/20/13 10:53 A
Yes, walking at 3 MPH is cardio. Light cardio, but definitely cardio.
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