The media has definitely covered the obesity epidemic in America in recent years and the situation doesn't seem to be improving. Doctors are coming up with anything they can to try to get kids to exercise a little more. One idea is to trick them into lifting weights by putting weights in their toys.

One study included five boys and five girls, who were an average of 7.5 years old, who were randomly assigned to carry either large, cardboard toy blocks that weighed less than a quarter of a pound (0.10 kilograms) or blocks that weighed about 3.4 pounds (1.55 kilograms)...

Overall, after an average of 10 minutes of carrying weighted blocks, the children experienced significantly greater increases in heart rate, oxygen uptake and energy expenditure than they did after carrying the lighter blocks, study findings indicate.

Interesting idea but I'm not sure this will work unless they come up with a really heavy GameBoy.