Is more always better? If your routine is maintenance focused and you can do 100 crunches and pull-up and pushups and body weight squats, wouldn’t you be gettin

Is more always better? If your routine is maintenance focused and you can do 100 crunches and pull-up and pushups and body weight squats, wouldn’t you be getting most of the brain-health benefits or do they only come by getting stronger and stronger and stronger? Are there not diminishing returns?