Danny Mackey on Josh Kerr's World Record Preparation with Amazfit at London Diamond League

Josh Kerr is preparing to chase history in the mile, and every detail matters.

Coach Danny Mackey explains how Kerr has approached his preparation, armed with data metrics. Using Amazfit wearable technology, the Olympic silver medalist gained an understanding of key performance indicators needed to train and recover smarter. During his World Record attempt, Kerr will be wearing a custom Amazfit Cheetah 2 Pro watch and a Project 222 Helio Strap and armband to capture his heart rate data.