Block periodization: accumulation, transmutation and realization

Accumulation, transmutation and realization in numbers

Block periodization is a training plan made of consecutive blocks of 2-4 weeks, each focused on one or two goals while the other qualities are only maintained.

You don't drop the lifts that aren't the goal of a block: 2-4 sets a week, which is MV, with the weight you've been using are enough to maintain strength (Spiering et al. 2021). You can count your sets per muscle group in the weekly volume calculator.

Where the phase names come from and what intensification means

The first block strategies were described by Yuri Verkhoshansky in the late 1970s (Bartolomei et al. 2025). The three blocks, accumulation, transmutation and realization, are described by Vladimir Issurin, who links the last one to supercompensation (Issurin 2019).

In many Western plans the middle block is called intensification, and the blocks are simply called hypertrophy, strength and peaking. An intensification block is the stage where the weight goes up, while intensity techniques such as drop sets or rest-pause extend a single set.

When block periodization makes sense

Block periodization won't build more muscle than a regular plan and gives no reliable strength advantage. It makes sense when you want to be at your strongest on a specific day: a 1RM test, a meet or a fitness test.

The model was created for athletes who need several performance peaks in a season (Issurin 2010); the periodization page compares all the models.

Block periodization for hypertrophy

In studies that compared block periodization with other models, muscle grew the same (Gavanda et al. 2019) or more with a different setup: when every session combined power, strength and hypertrophy work (Bartolomei et al. 2023) and when the rep range changed every week (thigh muscles in women, Bartolomei et al. 2015). For physique, what matters most is the number of sets per week, your training volume. If you like blocks, treat transmutation as 2-3 weeks of heavier sets in which no muscle group drops below MEV.

How to set up block periodization step by step

You set up block periodization backward: from the test or meet day, count back 2 weeks of realization, 3 weeks of transmutation before them and 4 of accumulation.

1. Pick 1-3 lifts the blocks should improve, e.g. the Barbell Squat and the Barbell Bench Press; keep running the other exercises as before, with double progression.
2. Work out your starting point, the estimated 1RM from your last heavy set, in the 1RM calculator.
3. In accumulation, do 8-12 reps at RIR 2-3 and add a set every week or every other week until the muscle group reaches the upper part of MAV.
4. In transmutation, cut the sets by 1/3 to 1/2, switch to 4-6 reps and add weight every week, ending sets at RIR 1-2.
5. In the first week of realization, keep the weight or add 2.5-5% and cut tonnage by 30-50%. In the test week, do one short session 4-5 days before the test, then only the test.
6. After the test, take a lighter week and start the next accumulation at 65% of your new 1RM: at 105 kg, 3 × 10 with 67.5 kg.

A moderate tonnage reduction over about 2 weeks produced better squat and bench press results than bigger cuts (Travis et al. 2020).

Test the squat in a power rack with the safety pins set just below the bottom position, and the bench press with a spotter. You can plan your warm-up in the 1RM calculator's warm-up sets mode. Then make 2-3 single attempts 3-5 minutes apart: about 95% of your old 1RM, then 100%, and 102.5-105% only if the previous attempt moved fast. If you don't compete, skip the max: do a heavy set of 2-3 reps at RIR 1 and calculate your new 1RM from it in the RIR/RPE calculator.

A 9-week block periodization example in kg

In this block periodization example, someone with a 100 kg squat 1RM and an 80 kg bench press 1RM runs 9 weeks: 4 of accumulation, 3 of transmutation and 2 of realization. You can work out the weights for your own 1RM in the 1RM calculator's plan weight mode.

The table is day A. You do each lift twice a week, on a heavy and a light day, as in an 11-week block study (Wetmore et al. 2020). On day B you lift 10-15% lighter with 1 set fewer, e.g. in W5 the squat for 3 × 6 at 67.5 kg. In accumulation, day B uses the lift variations from the parameters table, and through W7 also 2-3 sets of the Deadlift. W9 has no day B.

Add weight only when the last set of the previous week left at least 1 rep in reserve; if it didn't, repeat the weight. In weeks 4 and 7 the last sets will end close to failure: when the second-to-last set leaves fewer than 2 reps, do 1-2 fewer on the last one. When even your first set has clearly less in reserve than the table says, your 1RM is lower than you assume: take off 2.5-5% and continue the progression from that weight.

The tonnage of one squat session rises to 3,375 kg in accumulation and drops by 42% from week 7 to week 8, within the range that worked best in studies. In week 9, right before the test, it drops further; strength athletes take 1.5-4 days completely off before a meet (Winwood et al. 2026).

Block vs linear vs undulating periodization

Block, linear and undulating periodization differ in how many goals you train at once and how often the weight changes.

Realization isn't a deload: a deload reduces fatigue so you can keep training (Bell et al. 2023), while realization cuts tonnage but keeps the heavy sets and ends with a test.

Common mistakes

1. Blocks without a date. Without a test or meet, realization is two weeks of lower tonnage with no purpose. In that case, alternate accumulation and transmutation, with a lighter week every 2-3 blocks.
2. Blocks in name only. The blocks are called “Hypertrophy” and “Strength”, but your log shows the same 4 × 8 for 7 weeks. After each block, check that the rep range and the number of sets have changed.
3. Accumulation that's too heavy. Sets to failure in the weeks with the most sets carry fatigue into the block where the weight should go up. Go closer to failure only in transmutation.
4. Zero sets outside the block's goal. After more than 7 days without training, maximal strength dropped by 1-4% in studies (Travis et al. 2020). Give every lift outside the goal, e.g. the Deadlift in a squat and bench block, 2-4 sets a week.
5. Realization run like a deload. Dropping to 60% 1RM and RIR 4 in the last weeks is a deload, not realization. In taper studies tonnage always went down, while the weight stayed, rose or fell by at most 25%. Keep the transmutation weight or add 2.5-5%, and cut sets and reps.

What the research says

Block periodization has been studied mostly in competitive sport, and in strength training we found 6 direct comparisons with other models. Results for strength are mixed: a significant advantage for blocks in 1 of them (in the deadlift, in a study that didn't use the classic three blocks), a possible one in 1, an advantage for another model in 2 and no difference in 2. The author of the method collected 28 studies in its favor (Issurin 2016), but we rate the claim that blocks build more strength as weakly supported.

It isn't known whether block periodization builds more strength than other models in people who train for themselves: the meta-analysis of strength training didn't analyze it separately because there were too few studies (Moesgaard et al. 2022), and the direct comparisons lasted 6-15 weeks with 17-47 people.

What SmartWorkout logs show

So a block in the plan creator is often a one-week tab, and only about one plan in four with several blocks ends with fewer sets, as realization does. We calculate every number in aggregate, from at least 50 people.

How to set up block periodization in SmartWorkout

You set up block periodization in SmartWorkout in the plan creator: each block is a separate tab with its own name and weeks.

1. On the Workout tab, next to “My Plans”, tap “See All”, then “+” and “Create new plan”. In “Select load indicator”, choose RIR.
2. Tap “Add Block” and “Create mesocycle”, set “Number of units” to 2, and on the “Define Microcycle” screen add the exercises and set “Number of weeks” to 4.
3. On the “Define Mesocycle” screen, enter the sets, reps and RIR from the table above on each week's tab, then tap “Save”.
4. Press and hold the block's tab, choose “Edit Block Name” and type “Accumulation”.
5. Add a “Transmutation” block and a 2-week “Realization” block the same way. The generator offers an even number of weeks, so for transmutation choose 4 and delete the fourth week: press and hold its tab and choose “Delete”.
6. At the end of realization, do the test: Workout tab > “Start Workout” > “One Rep Max Test”.

An AI plan gives you a starting week repeated for several weeks; you add the blocks afterward in the plan creator.

With Premium, you see each muscle group's sets in every week of the plan against the volume zones, so you can tell right away whether accumulation reaches MAV and transmutation stays above MEV.

You can paste the whole example through plan import (“My Plans” > “See All” > “+” > “Import plan”) and check every block and week in the preview before saving. Import costs 10 AI credits, so the welcome credits cover it. The RIR in the fragment is the reserve from the table above, rounded down.

BLOCK: AccumulationWEEK: 1DAY: Day A- Barbell Squat | WU 2x5 | 3x10 RIR 3 | REST 150- Barbell Bench Press | WU 2x5 | 3x10 RIR 3 | REST 150DAY: Day B- Paused Squat | WU 2x5 | 2x10 RIR 3 | REST 150- Close Grip Bench Press | WU 2x5 | 2x10 RIR 3 | REST 150- Deadlift | WU 2x5 | 2x5 RIR 3 | REST 180WEEK: 2DAY: Day A- Barbell Squat | WU 2x5 | 4x10 RIR 3 | REST 150- Barbell Bench Press | WU 2x5 | 4x10 RIR 3 | REST 150DAY: Day B- Paused Squat | WU 2x5 | 3x10 RIR 3 | REST 150- Close Grip Bench Press | WU 2x5 | 3x10 RIR 3 | REST 150- Deadlift | WU 2x5 | 2x5 RIR 3 | REST 180WEEK: 3DAY: Day A- Barbell Squat | WU 2x5 | 4x10 RIR 2 | REST 150- Barbell Bench Press | WU 2x5 | 4x10 RIR 3 | REST 150DAY: Day B- Paused Squat | WU 2x5 | 3x10 RIR 3 | REST 150- Close Grip Bench Press | WU 2x5 | 3x10 RIR 3 | REST 150- Deadlift | WU 2x5 | 3x5 RIR 3 | REST 180WEEK: 4DAY: Day A- Barbell Squat | WU 2x5 | 5x10 RIR 2 | REST 150- Barbell Bench Press | WU 2x5 | 5x10 RIR 3 | REST 150DAY: Day B- Paused Squat | WU 2x5 | 4x10 RIR 3 | REST 150- Close Grip Bench Press | WU 2x5 | 4x10 RIR 3 | REST 150- Deadlift | WU 2x5 | 3x5 RIR 3 | REST 180BLOCK: TransmutationWEEK: 1DAY: Day A- Barbell Squat | WU 3x3 | 4x6 RIR 2 | REST 180- Barbell Bench Press | WU 3x3 | 4x6 RIR 2 | REST 180DAY: Day B- Barbell Squat | WU 3x3 | 3x6 RIR 4 | REST 180- Barbell Bench Press | WU 3x3 | 3x6 RIR 4 | REST 180- Deadlift | WU 3x3 | 2x4 RIR 3 | REST 180WEEK: 2DAY: Day A- Barbell Squat | WU 3x3 | 4x5 RIR 2 | REST 180- Barbell Bench Press | WU 3x3 | 4x5 RIR 2 | REST 180DAY: Day B- Barbell Squat | WU 3x3 | 3x5 RIR 4 | REST 180- Barbell Bench Press | WU 3x3 | 3x5 RIR 4 | REST 180- Deadlift | WU 3x3 | 2x4 RIR 3 | REST 180WEEK: 3DAY: Day A- Barbell Squat | WU 3x3 | 4x4 RIR 1 | REST 180- Barbell Bench Press | WU 3x3 | 4x4 RIR 1 | REST 180DAY: Day B- Barbell Squat | WU 3x3 | 3x4 RIR 4 | REST 180- Barbell Bench Press | WU 3x3 | 3x4 RIR 4 | REST 180- Deadlift | WU 3x3 | 3x4 RIR 3 | REST 180BLOCK: RealizationWEEK: 1DAY: Day A- Barbell Squat | WU 4x3 | 3x3 RIR 1 | REST 240- Barbell Bench Press | WU 4x3 | 3x3 RIR 1 | REST 240DAY: Day B- Barbell Squat | WU 3x3 | 2x3 RIR 4 | REST 180- Barbell Bench Press | WU 3x3 | 2x3 RIR 4 | REST 180WEEK: 2DAY: Day A- Barbell Squat | WU 4x3 | 2x2 RIR 1 | REST 240- Barbell Bench Press | WU 4x3 | 2x2 RIR 1 | REST 240

Add the accessory exercises in the plan creator.