Reading only what agrees with you is comfortable and teaches nothing. Holding a view you don't share long enough to state it fairly is real cognitive work, and it's the work most feeds are designed to save you from.
Sensible, and a common recommendation. Not a studied brain intervention. Evidence: worth trying
Same theme: Keeping the brain plastic
Keeping the brain plastic
Ask someone to explain their thing
Once a week, get someone to explain something from their world that you don't understand. Follow it properly. Ask the stupid question.
20 minEvidence: worth trying
Keeping the brain plastic
Assume you can get better at it
When you're bad at something, treat it as "not yet" rather than "not me".
no timeEvidence: worth trying
Keeping the brain plastic
Delete the brain-training app
If the goal is a sharper head, swap the app time for a real skill. The app makes you better at the app.
no timeEvidence: solid