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@Momfav A warm welcome to our Community! Sorry for the delay in my reply.
Let me help you with your exercise settings. Since both modes will read your heart rate I believe you can chose either but if you wish you can try one day with one setting and another day with the second option and see which one works for you. Now on a personal level I would chose circuit training as you do different exercises during this sessions.
Let me know how it goes.
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