Please choose the correct ending to complete the given sentence: Health: [header] How to exercise to ease back pain [title] Talk to your doctor. [step] Particularly if you have back pain following an acute injury, you need your doctor's permission before starting any exercise regimen. Your doctor can advise you on which types of exercise would benefit you personally based on your specific injury.

Ending1: [substeps] Meeting with a doctor is considered a safe bet, particularly if you received a prior injury and are going to include a range of aches and pains that you haven't mentioned to your doctor. Your doctor may also be able to refer you to an exercise class or group that will provide physical and occupational support to you. Ending2: [substeps] You can come up with a set of exercises for each type of dispute or injury that you and your doctor can agree to. If your doctor hears about your injury or expect to see it again, she'll evaluate the injury and determine which exercises are best to follow. Ending3: [substeps] If you are recovering from an acute, the doctor may prescribe a medical treatment to deal with your back pain. Non-acute injuries usually do not require medical treatment. Ending4: [substeps] If you haven't exercised for an extended period of time, you may also want to have a complete physical to ensure that you're well enough to begin an exercise program. Your doctor also can advise you on various conditioning exercises, in addition to regular walking, that might benefit you.

Answer format: ending1/ending2/ending3/ending4