"When we exercise our brains, we put our neurons and connections between neurons in action. Given the diversity of functions outlined above, it is clear that different activities are going to activate different brain areas, which scientists now know thanks to neuroimaging techniques. There is no one magic bullet that is best (either crosswords puzzles, or computer-based programs, or physical exercise): we do need a variety of mental stimulation or "brain exercises".
- Source: Sharpbrains
Also read: Interview with Carol Dweck