Jillian Michaels' Fitness Ultimatum 2009 sells a lot of copies and developer 3G Studios hints at a sequel.
From the article:
"Bucking the "conventional wisdom" that says third party games do not sell well on the Wii (even though they do), 3G Studios has announced that Jillian Michaels' Fitness Ultimatum 2009 has sold over 500,000 copies in the United States."