Yomif Kejelcha set a new potential world record in the half-marathon, wearing an Amazfit Cheetah 2 Pro and a Whoop MG. The Cheetah 2 Pro displayed his splits, while the Whoop MG recorded physiological data. Neither mark has been ratified.

The Cheetah 2 Pro, Amazfit's top running model, features a Grade 5 titanium frame and a 1.32-inch AMOLED display. It offers GPS tracking, topographic maps, and running power estimates. The Whoop MG, however, lacks a display and focuses on heart rate and physiological data. Read more racing coverage.

Kejelcha's choice of watches reflects a trend among elite marathoners. Despite the high-tech options, many top runners prefer simpler models. Kejelcha's next race is the Valencia Marathon on Dec. 6. Related: Ethiopian Runner Breaks Men's Half Marathon World Record.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.