Joining the number of other fitness titles emerging in the wake of Nintendo's Wii Fit, the recent information leak from marketing research group Intellisponse indicates that a Wii Yoga game is in some form of prodction.

"Follow along with an inspirational yoga guru instructor matching their on-screen poses, stretches and triangular positions with the motion sensing Wii controller and balance board," read a document entitled Wii Yoga, which NeoGAF found among the many internal docs contained within the company's unprotected server backend.

It is not known which company is commissioned the market research, though Intellisponse clients include Activision and Disney Interactive. It is also unclear as to how the title may differ from the Yoga mini-games included in Wii Fit, that is, if the product ever appears in the marketplace.

Adding to the burgeoning Wii fitness genre, a trio of companies today announced that Jillian Michaels' Fitness Ultimatum 2009 will arrive on Wii this "holiday season."

Supporting the newly-released Wii Balance Board, the game puts players into a "boot camp" that offers weight loss, strength training, interval and hill climbing activities. Only three mini-games were revealed: crossing monkeybars, climbing ladders and rowing.

Completion of the activities are said to unlock motivational "lifestyle and fitness video tips from Jillian." A two-player mode will also be available.

Billed as the first Wii game to feature "a celebrity fitness trainer"--Michaels serves as a strength trainer and life coach on NBC's The Biggest Loser--the project stems from a three-way collaboration between publisher Majesco, property holder Interactive Game Group and developer 3G Studios.