What’s the equivalent of this cardio for our ailing brains? A good candidate is reading. Making sense of written text exercises our minds in important ways. We develop what the cognitive neuroscientist Maryanne Wolf calls “deep reading processes” that rewire and retrain neuronal regions in ways that increase the complexity and nuance of what we’re able to understand. “Deep reading is our species’ bridge to insight and novel thought,” she writes. Perhaps consuming a few dozen book pages a day should become the new 10,000 daily steps — a basic foundation of activity to maintain cognitive fitness.