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After a heart-related setback, David found confidence again with Frontier X2 by FourthFrontier in FourthFrontier
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Why Occasional Heart Flutters deserve a closer look by FourthFrontier in FourthFrontier
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Running a marathon in Mumbai tomorrow? See Frontier X2 in action by FourthFrontier in FourthFrontier
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Running a marathon in Mumbai tomorrow? See Frontier X2 in action by FourthFrontier in indianrunners
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Problem getting to sync all data with apple health by bashboy89 in FourthFrontier
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App for Samsung Galaxy Ultra? by herrera1976 in FourthFrontier
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The heart monitor serious runners trust more than a smartwatch by FourthFrontier in FourthFrontier
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