Lambert said the technology is currently being used on 30 horses per week during morning workouts at the track. The goal is to eventually use it on every horse in training to reduce the number of catastrophic injuries during races.

. . . .

Since the start of the 2023 Spring Meet, StrideSafe sensors have been used on every horse during every race at Churchill Downs, including the Kentucky Derby. The device is located on the rear end of each horse in a pocket just below the saddle.
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https://www.wlky.com/article/churchill-downs-stridesafe-prevent-horse-deaths/44095747

I would love to know if Wild On Ice had a sensor during his workout.