How to increase stamina? Whilst it is crucial to stay active with exercise, if you want to increase stamina, get yourself rested well. A good night’s rest will leave you energized, refreshed, and focused, making sure that you can physically give your all. It is shown that bad sleeping habits have been linked to some health problems that could negatively affect your stamina, such as high blood pressure, weight gain, and so on. Adults are recommended to sleep about 7 to 9 hours per night because getting less than 6 hours of sleep per night might be unhealthy and has been associated with health problems.