When Fitbit Inc. launched its first wearable fitness tracker, the market was mostly confined to low-cost pedometers. Thirteen years later, people are hungry for devices that monitor everything from blood oxygen to sleep patterns, which has lured tech giants such as Apple Inc. into the segment.
James Park, Fitbit’s co-founder and chief executive officer, is intent on not being left in the dust. Fitbit’s new Sense smartwatch, which recently went on sale, is packed with the latest health-tracking features. The company also is…