Surfing the internet
I like observing people in the internet clubs, for example. A person who does not know that he is watched display so different face looks to make observing really interesting. The scientists suggest that during the search in the internet, brain activity is stimulated and even improved. The matter is that a person is trying to find the needed information, analyzing how it is better and quicker to do, reflecting what information is important or useless... many neuron processes are observed during the web search. They say that brain activity depends on the professional skills of a searcher. For example, more skilled person would display more brain activity. So, as a matter of fact, judging by brain activity the search of the information in the internet can be compared with a research work. Such mental abilities as decision-making and imagination are developed in such a way too. These internet exercises are recommended to the middle-aged and old people in order to stimulate brain activity.
Roughly speaking, if you wish to train your brains, you have not to follow the complicated exercises. It is just worthy searching for some information in the Web. As a matter of fact, I am not surprised about these results of the scientific tests. There is so much information in the internet nowadays that you need really hard brain work in order to understand where to find and how to find.