Please choose the correct ending to complete the given sentence: Health: [header] How to treat arthritic knees with tai chi [title] Talk to your doctor. [step] Even though tai chi involves gentle, low-impact movements, it's still a good idea to ask your doctor about it. Depending on your condition, there may be other things you need to do first.

Ending1: Ask if there are other activities you should talk about with your doctor. [substeps] If your knee pain is severe enough to require intensive treatment, your doctor may also advise you to see a physiotherapist or physical therapist. Ending2: [substeps] Talk to your doctor about how you'll use tai chi. Before using it, be sure to do it about two times a week. Ending3: [title] Make sure to take herbal remedies. [step] Normal knee pain necessitates your body to take simple steps to calm down before or during active stretching. Ending4: [substeps] If you have significant balance or coordination issues, tai chi may not be well-suited for you. This is also true if you take medications that make you dizzy or lightheaded as a side effect.

Answer format: ending1/ending2/ending3/ending4