What Are the Best Fitness Machines for Quads and Hamstrings? | livestrong
Amazon.com : Body-Solid (GCEC340) CAM Series Adjustable Leg Extension and Curl Machine - Comfortable, Heavy-Duty Home Gym Equipment for Hamstring and Quad Workouts : Leg Exercise Machines : Sports & Outdoors
How to Do a Leg Extension: Techniques, Benefits, Variations