Vision VST600-S531 Ab / Low Back – Dual Core Strength Machine for Commercial Gyms | Fitness Specialist TXVST600 S531 Ab Low Back Commercial Dual Core Trainer Fitness Specialist TX The VST600 S531 Ab Low Back is a high durability, space saving selectorized machine designed to target abdominal and lower back muscles. Engineered for commercial environments, this dual function unit has been tested to exceed one million repsmaking it four times more durable than industry standards. The ergonomic seat and adjustment features provide personalized comfort, while