High-intensity exercise isn’t just good for your muscles — it might also be the key to keeping your brain sharp as you age. A new study from the University of Queensland has found that older adults who engage in high-intensity interval training (HIIT) can boost their cognitive function, and what’s more, these benefits can last for up to five years. The study, published in the journal Aging and Disease, is one of the first to show that exercise doesn’t merely delay cognitive decline — it can actively improve cognitive performance in healthy older adults. Led by Emeritus Professor Perry Bartlett…