The leg extension is one of the most effective exercises for building muscle in your legs and toning your lower body. By isolating the quadriceps muscle group, a leg extension machine allows you to focus your workout and build strength in your thighs quickly.
Leg extension machines are also fantastic for your knee joint health, and can help reduce knee pain by strengthening the vastus muscles. These provide support for your knee joints, so exercising them can help with rehabilitation after an injury, or help prevent future injuries.