Health app - Cardio Fitness
Why is my workout at the gym with my heart rate going as high as 120 during a 60 minute session less important to my cardio fitness than a 1.75 mile walk?
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The short answer: because that's the way Apple designed the watch.
The longer answer: Walking or running tend to be continuous activities. Whatever you were doing in the gym may not be. It's probably a lot easier and more accurate to get information from continuous activities.