As hyrox soars in popularity, Nike Inc. has a new training footwear system designed for the fitness race. You May Also LikeThe Nike Hybrid RN will release in China on Sept. 24, followed by global availability on nike.com and select retail locations beginning Oct. 8. Nike created the two shoes so athletes no longer have to choose between running shoes built for speed and training shoes aimed at stability. R-1 shoe aimed for higher-rep workouts that include running, making it a gym shoe suitable for elite Hyrox athletes. Its Hyrox shoes feature Puma’s Nitro foam technology and PumaGrip traction, and the brand has been expanding its Hyrox-related offerings.