This is not a trick question. I meant are you feeling tired, pain or muscle tense even though you have exercised regularly, jog, swim or even going to the gymnasium; but still feeling tired?
If you do, then it is probably that your muscles have worked to such a way that they have overly stressed the tendons to their limits until your whole body feels like a bow being pulled to its brim.
If such symptoms are ignored, then gradually you will find difficult to move or even carry even light objects. The only remedy is to perform stretching exercises to straighten the tendons and to loosen the muscles.
Apparently, over exercise can bring harm than good.