For long, physical activity has been thought of as effective for maintaining cognitive function. However, the authors of this study hypothesised that physical fitness may be an even better predictor for preserving cognitive function. They highlight how comorbidities, such as obesity and type 2 diabetes, are commonly associated with lower physical fitness levels and cognitive decline in aging populations. Exercise is often thought of as a helpful strategy in preserving cognitive function, but this article more closely investigates whether physical activity (PA) alone or actual physical fitness (PF) is more beneficial is preserving cognitive function.