Reevo Supa Kuzushi Judoka/BJJ Grip Trainer Use in the weight room to incrementally add weight and resistance so you are always pushing your limits making you stronger with every rep. Simulate chokes, throws, kuzushi, grip breaking in the gym or on the mat. Use free-training with elastics, training partners, belts or cables. Loop the heavy nylon belt around barbells, dumbbells and chin-up bars to add versatile to your workout. The fastest most effective way to develop pulling techniques with your entire body.