Excerpt (first 2 paragraphs)
There's no doubt that Nintendo's Wii Fit is fun - but is it exercise? Depends on who you ask.
A report issued just in time for holiday gift giving suggested that playing Wii games in your basement is tantamount to heading to the gym - or almost. The Nintendo-funded study reported that one-third of the games included in Wii Sports and Wii Fit products boosted energy expenditure equivalent to 3.0 METs (1.0 MET is the metabolic equivalent of the energy expended while seated; 3.0 METs is three times that energy), which classifies it as moderate-intensity exercise.
Full article at: