DEADLIFT WITH STRAIGHT LEGS
Fix the carriage so that the handle bar is in front of the shinbone.
Take a wide stance just behind the bar. Grasp the bar with a shoulder-width overhand grip and pull it upwards. The torso is elongated and the lower back is slightly arched. Look straight ahead. Keep a slight bend at the knee joint.
Bend forward with your torso elongated over the hip joint until it is parallel to the floor. With your arms fully extended, lower the bar close to your legs. Push your buttocks backwards. Your head is in line with the spine. Then slowly return to the starting position.
To learn the movement, the carriage can be set higher (e.g. bar below knee joint). When you have mastered the movement, you will fix it deeper step by step.
During the entire exercise, keep the torso elongated and slightly arch the lower back (no bending).