Testing the Best Fitness Trackers at the NYC Marathon

A runner tested seven fitness trackers during the NYC Marathon and training, finding the Whoop MG, Garmin Forerunner 570, and Apple Watch Ultra 3 to be the top performers, with each excelling in different areas like recovery, detailed metrics, and smart features. The choice depends on whether the focus is on health, training data, or smart features, with recommendations tailored for different needs.