Dance the pounds away!
Unlike previous versions, Extreme lets you to play the main game with Workout Mode allowing you to be graded therefore unlocks songs, dancers, modes and so on like you would normally. A simple but huge improvement!
I recommend this game to anyone who needs to lose a few pounds or just needs to keep exercising in the winter. It's great aerobic exercise plus the music is great. My one beef is that the song list is not quite as great and DDRMax and DDRMax2. If you want the best songs all 'round get them instead.