Here is a study in the BMJ – British Medical Journal about the impact of new age video games and children’s fitness. Click the image below and give it a read.

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“Wii Sports bowling (190.6 (22.2) kJ/kg/min), tennis (202.5 (31.5) kJ/kg/min), and boxing (198.1 (33.9) kJ/kg/min)”

While the conclusion says not enough…to completely be the only source of fitness.. the reality is it’s a beginning, a start in the right direction.  Play it more.  Play new games.  Player harder and the calories burned will increase.