Body Solid GCEC-STK PRO-Select Leg Ext & Leg Curl Machine 210lb StackThis most versatile leg machine performs the two most important leg exercises from one comfortable position. The fully adjustable 7 gauge steel cam maximizes range of motion capabilities with a biomechanically correct seat angle for proper isolation of muscle groups. Strengthen your quadricep muscles with the leg extension exercise by positioning your legs behind the oversized rollers, firmly grip the handles and lift.. (Leg hold down in storage