Fitness is a big topic these days and especially within the gaming realm. Nintendo first promoted its Wii Fit line of gaming products as a method of losing weight and being healthy. Well, now it seems as if the 3DS is also taking a similar route with a built in pedometer that will earn game coins to be allocated to the game of your choice.
These kinds of things are more of a fad than anything else. Anyone who thinks they can get in shape by walking or walking for coins will probably be disappointed. My reasoning for this move by Nintendo is that this will motivate people to carry their 3DS with them EVERYWHERE! (Hence, increasing the likelihood of people playing their 3DS) Genius I say!