Please choose the correct ending to complete the given sentence: Health: [header] How to avoid back pain [title] Stand properly. [step] Keep your pelvis in a neutral position, neither thrust forward nor pulled back. Avoid standing in one place for long periods.

Ending1: The more easily you can adjust your position, the more flexible your spine will be. [title] Rest it before you try to sit. Ending2: If you have to for work or some other reason, try to put one foot on a footstool and lean on it to reduce the load on your back. Change from your left to right foot after several minutes to avoid straining. Ending3: This is important for pain management in the spinal joints. [substeps] If possible, stand at an angle, so that the floor is directly in front of your feet. Ending4: [substeps] Look in the direction of your head to see if your pelvis is tilted forward. If it's tilted to right, then you have a soft pelvic region; if it's tilted to the left, then you have a hard pelvic region.

Answer format: ending1/ending2/ending3/ending4