The games that come on the Wii Fit are Yoga, Strength, Aerobic and Balance Games.
These exercises are split into four different categories: yoga, muscle, aerobic, and balance. The yoga and muscle categories feel the most like traditional exercise, with 15 yoga poses and 15 muscle-toning moves to work through. Yoga poses range from the absurdly simple (standing still and breathing--yep, that's all) to the quite difficult and possibly lawsuit-in-the-making shoulder stand. It's a similar situation with the muscle-toning section, with basic lunges mixed in with more strenuous activities such as the parallel stretch and push-ups. Virtual trainers (you can choose from either male or female) guide you through the yoga and muscle exercises, offering praise or criticism depending on how well you're doing.
The aerobic and balance activities represent the fun side of Wii Fit with 18 games to choose from. The aerobic games include hula hoops, Wii Sports-like boxing, step dancing, jogging, and more. The balance activities are what most casual users of Wii Fit will first gravitate to, and include ski jump, ski slalom, snowboarding (where you have to turn the balance board sideways), a table tilt game where you have to use your shifting weight in a Mercury Meltdown-style challenge, and more.