Do insects get exhausted?
Let's say an ant is about 1 cm length, it's normal from him to run around the house.
Let's say as well that he want to run from the font door, to the table, which total distance it 10 m.
He can do it easily but the distance is 1cm*100cm*10m = 1,000 times his body lenght. If a man is 1.8m high, it would like this man walks/runs for 1,000 times of his hight, which is 1000*1.8 = 1800m = 1.8km. Even if he walls, it's still a little tough task which an ant can do it easily with even more distance.