Deliberate strengthening activities need to be provided at a young age. When connections are weak, multisensory integration activities are SOOO very important in establishing general connectivity. Then there are specific exercises that strengthen specific connections according to need, like phonics, executive function, imitation and joint attention activities. Just like cardio exercises are good for the whole body in general, but if you need to strengthen a specific muscle, you need exercises for that isolate and strengthen that specific muscle. Multisensory integration activities are the brain connection cardio.