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Interleaved practice
Mix the types when you're learning to tell things apart. Cram one at a time for words.
Retrieval practice
Shut the book and write down what you remember. Rereading is a con.
Spaced repetition
Review it, sleep, review it again. Never sit and reread the night before.
Notification elimination and interruption management
Kill every notification and answer people only when you've finished the piece.
"Dopamine detox" / dopamine fasting
Delete the apps, keep talking to people. The reset is a habit fix, not chemistry.
Speed-of-processing training
Skip the brain-training subscription. You get faster at the game and nothing else.
Dual n-back and working memory training
Play n-back if you enjoy it. Don't play it to get smarter.
Commercial brain-training software
Cancel the brain-training app. You're getting better at the game, nothing else.
Single-variable testing
Test one thing at a time, on and off twice, or you're guessing.
Gait speed
Time your usual walking pace once a year. Then train the legs and lungs behind it.
Grip strength
Buy a dynamometer. Test once a year. Don't train grip and call it longevity.