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Girl Checking Her Heart Rate on Smart Watch after Gymnastic Exercises. Stock Image - Image of heart, fitness: 202919569
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Smart Watch women, 1.3 inch smart Watch IP67 waterproof, fitness tracker with activity tracker blood pressure measurement, fitness Watch wrist Watch pulse monitors pedometer Watch for iOS Android(silver) | Fruugo UK
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Fitness trackers aren't very accurate at measuring heart rate — and that can be dangerous - The Verge
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