Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to tackle [title] Maintain the proper position and tackling form. [step] Your head should be up and your eyes should be on the ball carrier at all times when you're playing defense. Your feet should be shoulder-width apart, with your knees bent and your shoulders back.

Ending1: When blocking, your arms should be straight and your arms don't swing or slide. While offensive players can perfect how to tackle from far back, some players who prioritize an offensive position tend to be better at tackling from front or side. Ending2: Ideally, you want to have your back at about 45 degrees relative the ground. [substeps] This is sometimes referred to as " breakdown " position. Ending3: Your back should be parallel to the ball. Your shoulders should be near your hips, rather than touching. Ending4: Place the ball carrier clear of your field of vision or your opponents view. Minimize incoming chance of injury and generate power in your technique.

Answer format: ending1/ending2/ending3/ending4