What is Undulating periodization?

What is Undulating periodization?

Undulating periodization varies the rep range and load within days of each other instead of following a slow, multi-week march from high volume to high intensity. The most common form, daily undulating periodization (DUP), assigns a heavy day, a moderate day, and a light or high-rep day to the same lift each week, rather than dedicating separate multi-week blocks to each quality. The name comes from how the intensity and volume 'undulate' up and down on a graph from session to session, instead of the smooth, single-direction slope of a linear plan.

How it works

Frequently changing the rep range and load is thought to combat the repeated bout effect — the idea that the same training stimulus produces less adaptation each time it's repeated in a row — while letting a lifter train strength, hypertrophy, and endurance qualities in parallel each week instead of in sequence. The original 2002 study introducing the model, by Rhea and colleagues, found the undulating group gained more 1RM strength than a linear group training with equated total volume and intensity over 12 weeks, though later, larger reviews comparing the two models across more studies found similar hypertrophy outcomes overall. Because every session still contributes toward all of a lifter's qualities, undulating periodization tends to suit lifters who don't have one single event to peak for and instead want continuous, ongoing progress across a training year, revisiting each rep range often enough that none of them go stale.

Types

Worked example

A 1-week DUP pattern for the bench press, repeated across a training block.

The same lift is trained heavy, moderate, and light within one week rather than spending a whole month at each — fatigue from one session largely clears before the next arrives.

Undulating periodization vs linear periodization

Later meta-analyses find the two models produce similar long-term hypertrophy despite the original study's strength difference.

By goal

• Intermediate/advanced lifters: Use undulating periodization when progress has stalled on a linear plan — varying the rep range week to week can restart adaptation without a full deload.
• Lifters juggling multiple goals: Daily undulating periodization lets strength, hypertrophy, and endurance qualities all get trained in the same week instead of dedicating separate multi-week blocks to each.
• Lifters without a single peak date: If there's no upcoming meet or test to peak for, undulating periodization's continuous, non-linear structure often fits better than a linear plan built around one final peaking phase.

Common misconceptions

• "Undulating periodization always beats linear periodization for results." The original 2002 study found bigger strength gains from undulating training, but larger, more recent meta-analyses find the two models produce similar hypertrophy and often similar strength over time.
• "Undulating periodization means picking random daily weights." A real undulating plan follows a planned, repeating pattern — for example heavy, moderate, and light each week — rather than choosing arbitrary weights session to session.
• "Undulating periodization is only for advanced lifters." Beginners can use it too, but they typically progress just as well, or better, with the simpler pattern of linear periodization, since nearly any structured plan works early in training.

Related terms

Undulating periodization FAQ

What is undulating periodization?

Undulating periodization is a training model that varies volume and intensity frequently — often from session to session within the same week — rather than moving slowly in one direction over months, like a heavy day, a moderate day, and a light day each week.

What is daily undulating periodization (DUP)?

Daily undulating periodization is the most common form of undulating periodization: the rep range and load for a given lift change with every training session rather than staying the same for weeks at a time.

Is undulating periodization better than linear periodization?

The original 2002 study found undulating training produced greater strength gains, but later, larger meta-analyses find the two models produce similar hypertrophy overall — both are effective, well-supported approaches.

How often does training change in undulating periodization?

In daily undulating periodization, the volume and intensity change every training session — commonly 2-3 times per week per lift, such as a heavy day, a moderate day, and a light day.

Who should use undulating periodization?

Undulating periodization suits intermediate and advanced lifters who've plateaued on a linear plan, or anyone who wants to train strength, hypertrophy, and endurance qualities in parallel within the same week.

Can undulating periodization be combined with linear periodization?

Yes — many real programs undulate the rep range week to week (daily undulating periodization) while still nudging overall intensity upward across a longer block, blending both models rather than using either in a pure, textbook form.

References

1. Rhea MR, Ball SD, Phillips WT, Burkett LN. A comparison of linear and daily undulating periodized programs with equated volume and intensity for strength. J Strength Cond Res, 2002. PubMed 11991778
2. Grgic J, et al. Effects of linear and daily undulating periodized resistance training programs on measures of muscle hypertrophy: a systematic review and meta-analysis. PeerJ, 2017. PMC5571788
3. Non-Linear Periodization for General Fitness & Athletes. J Hum Kinet, 2013. PMC3588896
4. Periodized Resistance Training for Enhancing Skeletal Muscle Hypertrophy and Strength: A Mini-Review. Front Physiol, 2019. PMC6351492