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5/3/1 by Jim Wendler: How the Program Works
At first glance 5/3/1 looks almost too simple: four main lifts, three working sets, and weights that climb only slowly.
That is precisely the idea.
Instead of constantly finding out how heavy you can train today, you work from a deliberately conservative Training Max. The weights rise slowly, the most important sets stay submaximal, and progress is planned across months rather than across individual spectacular training days.
The base system is quick to grasp. It only gets more complicated once terms like BBB, FSL, 5s PRO, Jokers, Leader and Anchor enter the picture.
So, the foundation first.
5/3/1 in one minute
Classic 5/3/1 puts four lifts at the centre:
- Squat
- Bench press
- Deadlift
- Overhead press
For each lift you set its own Training Max (TM).
Every percentage in the program is calculated from that TM — not directly from your actual 1RM.
The main work runs across three loading weeks:
| Week | Set 1 | Set 2 | Set 3 |
|---|---|---|---|
| 1 | 65 % × 5 | 75 % × 5 | 85 % × 5+ |
| 2 | 70 % × 3 | 80 % × 3 | 90 % × 3+ |
| 3 | 75 % × 5 | 85 % × 3 | 95 % × 1+ |
In the classic version, the plus means: after the prescribed reps you perform further technically clean reps.
Then the next training block begins with a slightly higher Training Max.
That is the framework.
Why 5/3/1 does not calculate from your real maximum
Say you can bench press 100 kg cleanly for a single.
The obvious thought would be:
100 kg is my max — so I’ll base all my training weights on that.
5/3/1 deliberately takes a different route.
You use a Training Max that sits below your actual maximum. Different generations and programs within the 5/3/1 system use different starting points; they often sit roughly in the range of 85 to 90 % of a realistic 1RM.
With a true 1RM of 100 kg, your TM might be 90 kg, for instance.
The 95 % in week 3 would then be:
90 kg × 0.95 = 85.5 kg
So you are not training with 95 % of your true maximum, but with 95 % of an already conservative planning number.
This is not a detour. It is one of the system’s most important principles.
Why the Training Max is conservative on purpose
A lower TM makes the weights less impressive at first.
In exchange it buys you something more valuable: headroom.
If every working weight already sits at the edge of your current ability, there is barely any room for bad days, technical improvements or long-term increases.
A conservative TM instead lets you accumulate heavy reps without turning every week into a max attempt.
That fits one of the best-known core ideas of 5/3/1:
start light enough, increase slowly, and own the weights over the long run.
The Training Max is therefore less a fitness test than a control variable.
The three weeks in detail
Week 1: the 5s week
| Set | Reps | % TM |
|---|---|---|
| 1 | 5 | 65 % |
| 2 | 5 | 75 % |
| 3 | 5+ | 85 % |
The first week has the lowest intensity.
That does not mean the final set is necessarily easy. Thanks to the plus, you can go well beyond five reps there.
Week 2: the 3s week
| Set | Reps | % TM |
|---|---|---|
| 1 | 3 | 70 % |
| 2 | 3 | 80 % |
| 3 | 3+ | 90 % |
The weight goes up, the prescribed rep count comes down.
Week 3: the 5/3/1 week
| Set | Reps | % TM |
|---|---|---|
| 1 | 5 | 75 % |
| 2 | 3 | 85 % |
| 3 | 1+ | 95 % |
This is where the heaviest set of the cycle sits.
The 1+ should not be understood as a planned 1RM test, though. Because the percentages come from the Training Max, several technically good reps should normally be possible.
How to read that set sensibly is a topic of its own:
The plus turns a percentage plan into a feedback system
Without the plus, 5/3/1 would essentially be a simple percentage plan.
With it, something more interesting happens.
Say in one cycle you press:
85 kg × 5
A few cycles later, on a comparable heavy set, you manage:
85 kg × 8
Your capacity has changed, even though you never made a genuine max attempt.
That final set can therefore give you three things:
- a rep PR
- a trend in your estimated 1RM
- feedback on how well your TM still matches your performance
This is exactly why an AMRAP in 5/3/1 should not be treated as a weekly set to failure.
It is about productive reps, not about forcing one more somehow.
How does the Training Max go up?
In the classic system the TM is raised in small steps after a successfully completed cycle.
The familiar guideline is:
- Bench press and overhead press: about +2.5 kg
- Squat and deadlift: about +5 kg
That looks slow.
It is meant to.
5/3/1 does not try to transfer your theoretical strength gain onto the bar as fast as possible. It tries to keep moving your training weights upward under control for as long as possible.
A common mistake is therefore to “speed the system up” because the first cycles feel too easy.
Doing that removes the very buffer the program is built on.
Main work, supplemental work and assistance are not the same thing
An important distinction gets lost in many explanations.
A complete 5/3/1 session is not just the three percentage sets.
There are several layers.
Main work
These are the actual 5/3/1 main sets.
For example:
65 × 5, 75 × 5, 85 × 5+
Supplemental work
Additional work on a main movement can follow.
Examples:
- FSL — First Set Last
- BBB — Boring But Big
- SSL — Second Set Last
- other program-specific variations
Assistance
After that come exercises that can round out the session:
- pulling movements
- pressing movements
- single-leg work
- trunk work
- further smaller movements depending on the program
These layers have different jobs.
Which is exactly why you should not simply add volume everywhere.
If the supplemental work is already very demanding, something else usually has to give.
FSL: more work with manageable fatigue
One well-known supplemental variation is First Set Last.
The idea is simple:
After the main work you go back to the weight of your first working set.
One possible scheme is:
5 × 5 FSL
In week one that would be five extra sets of five at 65 % TM.
The advantage: you accumulate additional technically high-quality reps without going straight into very high rep counts.
FSL is therefore often easier to recover from than an aggressive volume block.
BBB: when volume moves to the foreground
Boring But Big takes a different approach.
After the main work you do:
5 × 10
with a considerably lighter weight.
50 reps of a main lift change the character of the session substantially. The weight per rep is lower, but the total volume is high.
BBB is therefore often used when muscle growth and additional work capacity are the priority.
Assistance is not the program’s secret main event
It is tempting to fit as many exercises as possible in after the main and supplemental work.
More chest.
A bit more triceps.
Leg press.
Curls.
Lateral raises.
One more superset, since you’re already at the gym.
This is exactly where an otherwise conservative program can suddenly become very fatiguing.
In Wendler’s later programs, assistance is therefore not treated as independent of everything else. The particular program determines how much supplemental work, assistance and conditioning fit together.
The important underlying idea:
The more you do in one place, the less room is left elsewhere.
Classic 5/3/1 and 5/3/1 Forever are not the same thing
A large part of the confusion originates here.
The original 5/3/1 is relatively easy to explain:
Training Max, three loading weeks, main work, slow progression.
With Beyond 5/3/1 and later 5/3/1 Forever, that grew into a considerably more extensive programming system.
There you encounter, among other things:
- 5s PRO
- FSL and other supplemental variations
- Joker sets
- Leader and Anchor
- the 7th Week Protocol
- program-specific assistance and conditioning prescriptions
That does not mean the classic system is “wrong” or outdated.
It only means that 5/3/1 today refers both to a simple base system and to a much broader family of programming.
Anyone starting out should understand the foundation first.
The variations make far more sense afterwards.
→ 5/3/1 variations: FSL, BBB, 5s PRO and more
Leader and Anchor: don’t push everything at once over the long run
One of the most important ideas from 5/3/1 Forever is separating different training phases.
Simplified:
Leader
Here the emphasis often sits more on building work and supplemental volume.
Depending on the program, 5s PRO, BBB or more extensive FSL work might be used.
Anchor
After that the emphasis shifts.
Supplemental work can come down while PR sets or other more intense elements get more room again.
The exact structure depends on the 5/3/1 program you have chosen.
What matters is the idea behind it:
You do not have to run maximum supplemental work, maximum assistance, hard PR sets, Joker sets and hard conditioning all at the same time.
Training has a limited recovery budget.
Leader and Anchor distribute different priorities across time.
Who is 5/3/1 for?
5/3/1 is particularly interesting if you:
- already perform the main lifts confidently
- no longer necessarily need to add weight from session to session
- like working with clear percentages
- prefer long-term over aggressive progression
- want to plan your strength training across months and years
It may be less attractive if, as a complete beginner, you can still add weight comfortably in almost every session.
In that case a simple linear progression can be faster and easier to understand at first.
Programs like Greyskull LP or GZCLP offer a more direct entry point, for instance.
The most common misconception: the TM has to prove how strong you are
A Training Max is not a record.
If your true 1RM is 150 kg, entering a TM of 150 kg gains you nothing, just because you can theoretically move that number.
Doing so removes the reserves the system deliberately builds in.
The TM is not supposed to look impressive.
It is supposed to produce good training weights.
So if your working sets get too heavy over an extended period, adjusting the TM is not a step backwards.
Quite the opposite: it keeps the system working.
5/3/1 in hitPR
hitPR includes several plans that use elements of the 5/3/1 system.
Their priorities differ:
- Wave periodisation (strength) uses additional 5×5 work.
- Wave periodisation (volume) uses 5×10 and is therefore closer to BBB.
- Wave periodisation (realisation) shifts the emphasis towards testing, or a more intense phase.
What matters here is not the name of a template.
What is interesting is that main work, additional volume and Training Max can be planned together and tracked across several cycles.
That is how individual percentages become a training trajectory.
Conclusion
At its core, 5/3/1 is remarkably simple:
You work from a conservative Training Max, train in recurring loading waves, and raise your planning weights slowly.
The key points:
- The percentages refer to your Training Max, not your true 1RM.
- A conservative TM is intentional, not a sign that you are training too light.
- The classic main work runs across a 5s, a 3s and a 5/3/1 week.
- PR or AMRAP sets provide feedback without constantly requiring genuine max attempts.
- FSL, BBB, 5s PRO, Jokers and similar terms are extensions of the base system.
- In 5/3/1 Forever, those elements are embedded in larger programs and Leader/Anchor phases.
- More training is not automatically better: main work, supplemental work, assistance and conditioning have to fit together.
So the actual principle behind 5/3/1 is less spectacular than many of its variations:
Train a little below your current limit, accumulate good work, and give the progression time.
Sources
- Jim Wendler: 5/3/1 — The Simplest and Most Effective Training System for Raw Strength, 2nd Edition.
- Jim Wendler: Beyond 5/3/1.
- Jim Wendler: 5/3/1 Forever.
- Jim Wendler: 5/3/1 for Beginners
- The Fitness Wiki: 5/3/1 Primer
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