Several outlets have published reviews of the best smartwatches and fitness trackers, with some focusing on specific features such as ECG capabilities or affordability. The reviews cover a range of devices from various brands, including Garmin, Oura, and Whoop, and are based on testing by experts, including certified personal trainers and fitness editors. The number of recommended devices varies across the reviews, with some outlets listing as few as 5 and others listing up to 15 or more.