Also , on Thursday , because I was not feeling well , I did n't run . I caught up on Sunday ( though not with running , but by moving furniture and boxes up and down two flights of stairs continuously for 3 hours . I was too exhausted to move afterwards , let alone run !

Question: What may be the cause of the narrator 's exhaustion ?
Answer: The narrator has not skipped workouts amid their busy schedule .The narrator has been working out .None of the above choices .The narrator has been distracted by other events .