Three training shoes ranked — Nike Metcon, NoBull Trainer, Reebok Nano X. The shoes built for the gym, not for running.
Quick verdict: Nike Metcon for the universal best buy, NoBull for serious CrossFit, Reebok Nano for the best Nike-Metcon alternative.
Nike · Cross-training
The defining cross-training shoe. Flat heel for stable lifting, durable upper for rope climbs and burpees, decent enough cushioning for short sprints. Pretty much the default in any commercial gym.
NoBull · CrossFit specialist
The shoe of CrossFit Games athletes. SuperFabric upper is genuinely indestructible, totally flat sole for lifting stability, less cushioning than Metcon — designed for serious functional training.
Reebok · Cross-training
The original CrossFit-partnered shoe. The Nano X4 brought back proper width in the toebox — comfortable for lifting and HIIT in equal measure. Often cheaper than Metcons.