Periodisation: linear, block and undulating, without the jargon

Periodisation has accumulated an intimidating vocabulary — macrocycles, mesocycles, accumulation, intensification, realisation — around a fairly simple set of ideas.

The core problem it solves: you cannot train maximally hard forever, adaptation takes time, and fatigue masks fitness. So training gets organised into phases with different emphases, arranged so that you are fresh and adapted when it counts.

Linear periodisation

The classical model. Volume starts high and intensity low, and over a long cycle volume decreases as intensity increases, ending in a peak.

Start with sets of ten at moderate loads, progress over months through sets of eight, then five, then three, ending with heavy singles and doubles before a competition or a test.

Works well for: beginners and early intermediates, single-peak sports, and anyone who wants a simple structure.

Weakness: qualities not being trained tend to detrain. By the time you are twelve weeks into a heavy low-rep phase, the muscular endurance and the volume tolerance built at the start have faded.

Block periodisation

Concentrated blocks each focusing on one quality, sequenced so that each block builds on the last.

A common structure: an accumulation block emphasising volume and work capacity, then a transmutation or intensification block converting that into strength at higher loads, then a realisation or peaking block reducing volume sharply to express the accumulated fitness.

Works well for: intermediate and advanced athletes with clear competition dates, and anyone whose training has enough volume that emphasis matters.

Weakness: requires planning and a fixed target date, and the detraining problem still exists, just over shorter windows.

Undulating periodisation

Varying volume and intensity frequently — within a week, or even between sessions — rather than across months.

A typical daily undulating week: a heavy low-rep session, a moderate session, and a higher-rep session, all on the same lift.

Works well for: people without a fixed competition date, general strength and size goals, and anyone who finds long monotonous blocks demotivating. It also maintains multiple qualities simultaneously, which addresses the detraining problem.

Weakness: harder to track progress cleanly, because you are progressing several rep ranges at once. And the variety can be a distraction if it becomes randomness.

Does it actually matter?

Honestly: less than the marketing suggests, and more than beginners think.

Comparative studies between periodisation models generally find small differences, and studies comparing periodised programmes with sensible non-periodised ones often find modest advantages for periodisation, mostly in trained populations.

For a beginner, almost any structured progressive programme works, and the effort spent choosing a model is better spent on consistency and technique.

For an intermediate, some structure is genuinely useful, because the ability to train hard indefinitely has run out and fatigue management has become the limiting factor.

For an advanced lifter with a competition, careful periodisation is important, because peaking is a real phenomenon and arriving fatigued costs measurable performance.

The principles underneath all of them

Progressive overload across the cycle, not necessarily within every week.

Planned reductions. Deloads, taper weeks, or low-stress phases. Every model includes them because none of them work without.

Specificity increasing toward the target. Training becomes more like the thing you are training for as the date approaches.

Variation in the stimulus across a cycle, so that no single tissue or quality is hammered continuously.

Any programme with those four features is periodised, whatever it is called.

A workable default

For someone without a competition, this structure covers most of it:

Four to six week blocks. Within a block, add volume week by week — sets, then reps — while holding load roughly constant or increasing it slightly. Then a deload week with volume roughly halved.

Next block, start slightly heavier than the previous block did, and repeat.

Every few blocks, change emphasis: a block with more volume in the eight-to-twelve range, then one with more work in the three-to-six range.

That is undulating within a broadly block structure, it requires no software, and it will carry most people for years.

The most common mistake

Programme hopping. Switching every few weeks because progress feels slow, which guarantees that no block ever completes and no adaptation is ever realised.

Almost any reasonable programme run for six months will outperform four excellent programmes run for six weeks each. The organisation of training over time only helps if you actually let the time pass.