Wave periodization
Also known as: Undulating periodization, DUP
Wave periodization is a loosely used term for planned, recurring changes in training volume, load, or repetition targets; it often refers to undulating periodization. Daily undulating periodization (DUP) changes the emphasis between sessions, while weekly undulating periodization changes it between weeks. The defining feature here is a back-and-forth pattern rather than one gradual direction.
A DUP setup might train the same lift with heavier sets of 4–6 on Monday, moderate sets of 8–10 on Wednesday, and lighter sets of 12–15 on Friday. The sessions are not simply "hard, medium, and easy": they can emphasize different strength qualities or distribute fatigue while retaining regular practice of the movement. A wave can also span several microcycles, such as a moderate, heavy, and lighter week before the sequence is adjusted.
The defining feature is the planned recurring variation. Changing a target because readiness is unexpectedly low is autoregulation, although an undulating program can also be autoregulated. Adding weight whenever a repetition target is achieved is progression. These decisions can coexist, but neither alone makes a plan undulating.
Compared with linear periodization, the changes occur more frequently and do not all move in one direction. Compared with block periodization, several qualities may receive regular exposure within the same short period rather than being concentrated in separate blocks. Load, training volume, and effort should still be coordinated; random changes create variety, not necessarily useful periodization.
A 2022 systematic review and meta-analysis found that undulating periodization produced greater one-repetition-maximum strength gains than linear periodization in volume-equated studies among trained participants, but not among previously untrained participants. It found no meaningful periodization effect on hypertrophy. The comparison does not establish that DUP is best for every lifter, lift, or goal, and the wider 2026 ACSM evidence review found no consistent outcome advantage from periodization overall. Use an undulating model when frequent changes serve practice, scheduling, or fatigue management—not because muscles require constant novelty.