I really like that ExerBeat lets you either pick your own exercises for a personalized workout or have the personal trainer create a workout for you based on your preferences or needs. You can even target the workouts to specific areas of your body if you're trying to tone one area or another. You can select as goals maintain healthy, relax, burn fat, relieve stress, or shape up when creating your workout.
None of the exercises are really difficult. In fact some (like the yoga) are actually fairly easy. I'm not sure that this is really going to provide a true workout for someone who exercises regularly. It is, however, definitely a great way to keep the kids active when they can't go outside to play or to encourage someone who isn't at all active to get in a little bit of activity without leaving the comfort of their television set.
ExerBeat is rated E (Everyone) by the ESRB.