Various new interactive "recreation items" that dupes can use to improve their attributes. the initial concept was for gym equipment but with only two stats that'd be covered by that alone i figure several other recreation stations could be made too. perhaps a "tutoring" mechanic, where a dupe with a higher level in an attribute could teach them.
here's some of the concepts for the machines, reusing vanilla animations where possible:

Treadmill: rec alternative to the manual generator without being powered. Dupes use manual generator running animation.

Weights: similar design to manual radbolt generator with same use animation.

Medical Dummy: a triage cot with the supply closet mannequin laying down for dupes to practice on.

Mini laboratory: Replica of the research station(s) that are used for studying science rather than blueprints.

Sand pit: excavation practice. reuse of compost pile animation?

Worktable: machinery practice.

Wood blocks: Building practice

Bake stand: Cuisine practice (sand cookies?)

Flight Sim: Piloting.

Petting Zoo: park sign like building. critters in the room that are tame can be cuddled and interacted with. general interaction with critters like cuddle pips also contributing slightly. moral boost for duplicants that spend time there.

Easel: painting practice.

Pottery rotor: alt creativity practice.