Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to protect your back while moving [title] Use a cart or a hand truck to push heavy objects whenever possible. [title] Be sure to push heavy objects instead of pulling. [step] Pushing will use stomach muscles and limit the strain on your back.

Ending1: [title] Keep your knees and torso moving in the same direction. [step] Do not twist or turn while you are pushing an object. Ending2: [title] Sit on one of the carts, if possible. [step] If you have smaller wheels, be sure that they are 4-6 inches (10.2-15. Ending3: [title] Use a regular backpack for moving heavy objects. [step] Pulling heavy objects will decrease its impact on your back. Ending4: [title] Push carefully, as small items can't be pushed far enough at a time. [step] Use the brakes when at the end of a stair column, and the sensor when at the other.

Answer format: ending1/ending2/ending3/ending4