Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a bent over row [title] Assume the correct form. [step] Place the desired weight on each end of the barbell. Stand in front of the barbell with your feet shoulder-or hip-width apart.

Ending1: While bending slightly at the knees, lean forward at the hips until your torso is at a 45 ° angle to the floor. Maintain the natural arch in your lower back. Ending2: Increase your weight when you see the barbell bending at a 90 degree angle. [substeps] Place the correct weight on each end of the barbell at a 90 degree angle. Ending3: Bend your arms behind your back, so they are parallel with the floor. If you are stronger than you look, your form will look more like a bent over row. Ending4: Stand straight up, with your body center-width-gap between your right and left hip bones. [substeps] Your right hip bones should be directly in front of your body and your left hip bones should be slightly in front of you, overlapping.

Answer format: ending1/ending2/ending3/ending4