. . . is to organize by category, such as "Cardio," "Strength" and "Flexibility" groupings. So, for example, Cathe recommends four cardio and two total-body strength workouts per week as a fat loss "rotation." I would add a few stretch tapes for flexibility.
You can get more specific -- say, "Upper body Strength," "Lower Body Strength," "Total Body Strength," "Step Cardio" "Outdoor Cardio," "Yoga", "Pilates," "Circuit," "Floor Work," "Abs", etc.
The basic "rule" is not to strength train the same muscle group within 48 hours, although some people make an exception for abs and, of course the Freestyle fans train legs daily!
Sample "generic" rotation
Monday Strength: upper plus Yoga
Tuesday Strength: lower
Wednesday Cardio :60
Thursday Strength: upper plus Yoga
Friday Strength: lower plus Cardio :30
Saturday Outdoor Cardio :60 plus Yoga
Sunday Rest