Fitbit Sense Advanced Smartwatch ($208, originally $250)
This fitness tracker smartwatch hybrid can track and analyze your sleep patterns, fitness and activity levels, and even mindfulness and stress. It has a built-in skin temperature sensor to help track your body's response to stress and blood oxygen levels and an ECG sensor to track your heart rate throughout the day.
This smartwatch also can help you assess whether you're ready to workout or take some time to rest. It has a long battery life of around six days with a single charge. Plus, with its fast-charging capabilities, you can get a day's battery life in just 12 minutes of charge time. It has a built-in mic and speaker, so you can take calls even when your phone is nearby but unreachable. It is compatible with both Android and iPhones. You can get notifications, access Amazon Alexa or your voice assistant, set reminders, and more.
