Vision VST600-S711 Leg Curl / Leg Extension – Commercial Dual Leg Machine for Quads & Hamstrings | Fitness Specialist TXVST600 S711 Leg Curl Leg Extension Commercial Dual Leg Machine for Quads & Hamstrings Strengthen and tone your legs with the Vision VST600 S711 Leg Curl Leg Extension. This space efficient dual selectorized station is engineered to withstand over a million reps, offering long term performance beyond industry standards. Its ergonomic, adjustable design accommodates users of all sizes while maximizing comfort and effectiveness in training your quads and