First of all, this sport is not only running on artificial wheels, but also grinding teeth, digging holes in sawdust and playing with two mice who live together.
First of all, running helps to consume excess energy and prevent fat accumulation, which leads to rats becoming "rat cakes".
Grinding teeth is more beneficial to the health of rats' teeth and the convenience of eating. Be sure to buy a grinding stick for the mouse, or it will use all the places it can chew to grind its teeth.
Digging a hole before going to bed is a mouse's favorite. Burying their bodies in sawdust will give them a sense of security.
On the one hand, fighting can exercise, on the other hand, it can also enhance feelings, but we should be careful not to turn fighting into fighting.
If the mouse looks lazy, it doesn't necessarily mean that it doesn't exercise. Maybe it's secretly exercising when the host can't see it at night.