@Kondo
Well if your TV is within view of the cage and you have cable you could just leave the remote in their cage. But I recommend against that if you have one of those internet access capable plans.
Hamster wheel is good for exercise like Olo said. If you have a good secure cage you can get little ladders and structure for them to climb about on. You know, re-prepose those Hamster tunnels.
Depending on how you like to play with your pet and your gender you could if male have a comparably scaled firm rubber dildo. That is an excellent item for them to practice climbing along and other skills on. Or if your female, a wide verity of imitation woman sexual areas are available that they could also practice with. (Sorry, started writing this before I thought to check your listed pronouns. I hope I haven’t offended you.)
Another idea is light novels. Pocket sized paper back books. That way they could open the covers and turn the pages to read them. Making them exercise for both their bodies and their minds.
Last suggestion for now. Depending on their mental state, small elastics make for good resistance training devices. To keep them toned and fit. And small building toys can be assembled and glued to make them into a small weight set. Just because they are light to you doesn’t meant they are light to your pet.
Oops, one more. They make small easels, paints, and canvas. With light enough brushes (Fine tipped or kids brushes) your pet can be a mini-painter. Clearly skill will vary.
HH1