Fatigue and a general lack of enthusiasm for life in general can be caused by poor nutrition and lack of muscular activity which reduces testosterone levels. Proper strength training exercise effects testosterone directly by stimulating the pituitary gland and once you get started on your program you will feel so much better. Having more strength and energy will give you a higher quality of life giving you back a 'zest for life'.All you have to do is get yourself started on a proper program of strength training. Long slow recreational endurance type activities will not give you back your man hormone; only working your muscles properly will do it. Don't disrespect your body with poor food choices and a no exercise lifestyle - you are only hammering your manhood, vitality and ultimately your life. Get going and turn this around - today is good.