Please choose the correct ending to complete the given sentence: Health: [header] How to prevent and manage sciatic pain [title] Stand up straight with your ears aligned with your shoulders. [step] Sitting puts extra stress on your lower back. Sit with your knees slightly elevated to reduce pressure on your spine.

Ending1: [substeps] Your body will need to relax during a sciatic nerve fracture. Sitting will stretch out your spine and thus will make it easier to sustain a sciatic nerve fracture. Ending2: Keep your arms straight and your palms on your thighs. [substeps] Avoid opening up your head, which will lead to more painful straining. Ending3: Make sure your back and buttocks sit against the back of the chair. It is a good idea to keep the spine moving throughout the day to prevent stiffness in the vertebrates involved with sciatica (l4-s4). Ending4: Using an arm or leg can increase blood flow to your lower back and prevent it from getting worse. [title] Sit in a standing position for at least 20 seconds per day.

Answer format: ending1/ending2/ending3/ending4