Lying leg curls are the top exercise for isolating the hamstrings - the muscles on the back of your thighs. ISO 5019 Leg Curl Machine is designed to give you focused and intense leg workouts with comfort and safety specifically in mind. The uniquely designed V-bench offers total hamstring isolation while helping reduce back stress and unwanted knee forces. A direct link movement arm design and sealed bearing pivot points deliver smooth and continuous range of motion as you lift for an uninterrupted workout.