Leg Extensions are an isolation exercise that primarily targets the quadriceps muscles of the thighs. This exercise is typically performed using a leg extension machine, where you sit with your back against a padded backrest and your legs hooked under a padded bar. By extending your knees against resistance, you lift the weighted bar until your legs are almost fully extended, then lower it back down with control. Leg Extensions are effective for developing quadriceps strength, improving knee joint stability, and enhancing overall lower body muscular endurance and definition. Proper form and controlled movements are crucial to prevent strain on the knees.