Pet mice??

Ok, well, I have three pet mice. (one black one named Deliah, one orange one named Coa Coa, and a black and white one named Moo Moo. They are all girls.<3) I love them very much but, I want to know what I should put in their cage to make them get into a little more shape.(They are mice you feed to snakes but I keep them as pets. <3) Their, just, well, Coa Coa and Deliah are really over weight. I have a weel, water drinker thingy, a edible hut, seeds, and their food in their cage. Does anyone know any healthy things to put in their cage? What I should take out. What I should put in the cage? I want to know what I should do to keep them healthy. Well, can I have some help? Please. <3

You can buy different diet foods for them, also take them out of the cage to play with them for extra exercise. They need exercise outside their cage, not just inside.

I always take them out of their cage I take them outside too. <3

Alright well just get some diet food for them at the pet store then

do you have a hamster ball for them? Those are so fun!