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Stamina is the ability of the body's muscles to work as long as possible without tiring, alongside its cardiovascular and aerobic systems. This simple description hides a wealth of complexity. Living systems are highly responsive and, as a result, highly adaptive. Stamina Upgrade utilizes a clever means of creating the pressure that activates the body's adaptive response. Over a month you will find your stamina slowly increasing and your capacity for sustained physical activity, improving.  

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