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Forget about stories that you have heard told by people who say that they know the real magic to boosting immune system. I assure you that those tricks will not work on you regardless of how long or hard you try them out. You might even end up giving up before you have achieved your goals.
Do not get frustrated before you have heard what professional trainers have for you. With their advice, it will take you very little time and effort to attain a powerful immune system that you have always wanted. They will give you a training model that has worked for most other athletes. I am sure that it will also work out well for you.