Preacher Curl Machine

The leg extension and leg curl use different biomechanics to complete the exercises. While leg extensions are performed upright, the leg curl can be done in a prone or seated position.The leg extension and leg curl use different biomechanics to complete the exercises. While leg extensions are performed upright, the leg curl can be done in a prone or seated position. In addition, the leg extension involves knee extension, while the leg curl use knee flexion.