The ability to engage in physical activity — whether the activity is Krav Maga, hitting the weights at the gym, hiking, or just carrying shopping bags to your car — requires a level of good health. In order to perform and feel well in your daily life, you must eat a nutritious diet that supplies the necessary nutrients so that all of your bodily functions are working properly. Every substance that you put into your body has an action or interaction with the cells of your body, so choose carefully.