Active Life: Extreme Challenge

In Active Life: Extreme Challenge jump on the mat, grab your Wii Remote, and challenge your whole body in 15 fun, adrenaline-fueled single and multiplayer activities like base jumping, rock climbing, skateboarding, BMX, street luge and wakeboarding! This game is known as Family Trainer: Extreme Challenge in Europe, and Family Trainer 2 in Japan.

Mat Controller
As of, the Mat Controller can be emulated in Dolphin with the GCPad. In the Gamecube configuration tab, set Port 1 to "Dance Mat". The Dance Mat is mapped to the GCPad according to the following:

D-Pad Up    = Blue Arrow Up D-Pad Down   = Blue Arrow Down D-Pad Left  = Blue Arrow Left D-Pad Right = Blue Square Y Button    = Orange Arrow Up A Button     = Orange Arrow Down X Button    = Orange Arrow Right B Button    = Orange Square Start Button = - Button Z Button    = + Button