Proper blood circulation is considered essential for maintaining a healthy body and ensuring that all organs function correctly. Hemoglobin, a protein present in the blood, continuously delivers ...

Your fitness tracker is capable of monitoring all kinds of data. The problem is keeping track of what it all means. SpO2 is just one example of a lesser-understood metric that can provide insight into ...

is a senior reporter and author of the Optimizer newsletter. She has more than 13 years of experience reporting on wearables, health tech, and more. Before coming to The Verge, she worked for Gizmodo ...