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How do fitness trackers measure your heart rate?
Everything you need to know about photoplethysmography (PPG), the technology behind heart rate measurements in fitness ...
Kate Hudson Reveals Which One of Her Son Ryder's 'Terrible' Tattoos Made Her 'Draw a Line as a Mother'
On a new episode of 'The Martha Stewart Podcast,' Kate Hudson opened up about her oldest son Ryder Robinson's tattoos and ...