Why does grandpa hamster run so fast?

Adult hamsters run very fast. Especially the old man, this species is neurotic, timid and not suitable for playing. If you want him to exercise, you can buy a running wheel or a mouse ball. If you can see him grabbing him with a big plastic bag, if you can't, look for a flashlight behind the sofa, under the door and under the table. Where is it? Where is it going? If you want to play, I suggest you buy a third-line home.