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Daily undulating periodization has been shown to produce superior strength gains compared with periodization in which the weight loads progress linearly from light to medium to heavy over the course of several weeks or months.
Most periodization models have a fixed schedule of progression that lifters are not allowed to deviate from regardless of their “readiness” on the workout day. Flexible periodization allows the load to be selected on the day of each workout based on the lifter’s readiness.
Flexible periodization resulted in significantly greater gains in leg strength compared with daily undulating periodization.
Flexible periodization appears to be the most effective method of incorporating heavy, medium, and light workouts. That said, being flexible does not mean that you can skip heavy leg workouts whenever you feel like it. Stick to your predetermined number of heavy, medium, and light days. – FLEX