What are the best ways to increase your stamina?

Physical Health Chronic Illnesses & Conditions
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What are the best ways to increase your stamina?

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I try to walk and make sure I am getting my B12 shots every month. I also take other vitamins to help with my body since I deal with so many autoimmune diseases. I think that the drs. feel I am doing well for so much that I have wrong with me.

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@Jennipain how did you increase your walking stamina?