Vision Fitness Leg Curl / Leg ExtensionDesigned specifically for toning and building major leg muscles, our space efficient, Selectorized Leg Extension Leg Curl dual station is tougher than you can imagine and more comfortable than youd expect. Its been tested to withstand over a million reps, more than four times the industry standard, and an easily adjustable ergonomic design makes it comfortable for virtually anyone to sit down and start strengthening their legs.