You have to listen to your body. It is not all exercise and nothing else. Eating healthy and getting plenty of rest is also important. I even started meditating for a few minutes every day, to see if I can slow my mind from going 300 miles an hour to going at a 100 miles an hour. But I still feel tired, so tomorrow, I am having my blood tested (and some other things) to make sure that my actual health is not affected and it is just my age that is beginning to show. I'm not worried, I can see if now: "you need more vitamins, or more vegetables...or whatever". I will let you all know later.