Training blocks, and what they are for

Ask what a training block is and you will usually get a lecture about periodization: macrocycles, mesocycles, accumulation, transmutation, realization. All of it is real, most of it was written for athletes peaking for a competition on a known date, and almost none of it answers the question somebody actually asked.

Here is the plain version. A block is a run of weeks with one job, closed by a week that backs off. That is it. Everything else is detail about what the job is and how long the run should be.

Why the weeks are grouped at all

Because progress and fatigue are bought with the same currency. The work that makes you stronger also makes you tired, and tiredness accumulates faster than it clears. Run building weeks back to back forever and there is a point where the fatigue is hiding the fitness: you are stronger than you were and you cannot show it, because everything you own is going into recovering from last week.

That is not a folk theory. The joint consensus of the European College of Sport Science and the American College of Sports Medicine states it as the first condition of training: overload has to happen, and it has to happen without the combination of excessive overload and inadequate recovery. A short term drop in performance that resolves with rest goes on to produce an improvement. Left unresolved it does not⁴.

Grouping the weeks is how you put a scheduled end on the accumulation. You build, you build, you build, and then you take a week that lets the fatigue drain while the fitness stays. What that lighter week should consist of is a subject of its own, and it is covered in the week you back off.

A block is not a plan for getting stronger. It is a plan for finding out how much stronger you got.

What the research actually supports

Two claims get made about periodization and only one of them survives contact with the evidence.

Having a structure beats having none, for strength. Pooling 81 effects from 18 studies, periodized training produced larger one repetition maximum improvements than non-periodized training, and undulating models came out more favorable than others¹. A later review that equated the total volume between conditions, so the comparison was about the arrangement rather than the amount, found the same thing for strength².

Which named model you pick matters much less than the industry suggests, and for muscle size it did not matter at all. That volume-equated review of 35 studies found no difference between periodized and non-periodized training for muscle size, and no difference between linear and undulating for size either. Undulating beat linear for strength only in the trained subgroup, and not at all in people new to lifting².

Read together, that is a permission slip. If you are not a competitive lifter peaking for a date, you do not need to choose between periodization models, and you certainly do not need one in order to build muscle. You need weeks that are grouped, a job for the group, and an end to it.

How long a block should run

The literature will tell you anywhere between two and twelve weeks depending on which tradition you read, which is another way of saying nobody has established it. So the more useful number is what people who compete actually do.

246 competitive powerlifters, weightlifters, strongman competitors and physique athletes were surveyed about it. Every one of them deloaded. The gap between deloads averaged 5.6 weeks, and the deload itself averaged 6.4 days³. So the block most competitive lifters run is somewhere around five or six weeks of building, then most of a week that backs off.

The other finding in that survey is the one worth copying. Most of them plan it: roughly half deloaded to a pre-planned schedule and only a small minority worked purely off how they felt, with the rest doing both³. Waiting to feel bad means the block ends at the point where the fatigue has already cost you weeks of training you cannot get back.

What to put in one

1. Give the block one job. Getting stronger on four lifts is a job. Getting stronger on four lifts while adding an inch to your arms and running a personal best five kilometers is four jobs, and the block will deliver none of them.
2. Keep the exercises still. The whole value of a block is that you can compare week three against week one. Change the movement and you have thrown away the comparison, which is the only evidence you were going to get.
3. Progress inside it, not between blocks. The reps and the loads climb week by week. The block boundary is where you back off and then decide what the next job is, and it is not where the progress happens.
4. End it before you have to. A block that ends because you planned it ends with you fresh. A block that ends because you are beaten up ends on a decision somebody else made for you.

What a block is not

It is not a program you finish and grade. Nothing is measured at the end of a block except how the last few weeks went, and a block that produced two good weeks and one bad one is a normal block rather than a failed one.

It is also not a commitment you have to serve out. If a lift has been flat for weeks, that is information now and not at the end of the month, and the answer is usually to change the movement rather than to keep driving the same load into the same joint until the calendar says stop.

Build for a few weeks. Back off for one. Then decide what the next few weeks are for, while you are rested enough to decide it well.

What Reckoner does with it

Reckoner runs your training in blocks, closes each one with a week that backs off, and offers you a choice about what the next one is for when it ends. The lighter week is counted in weeks you actually trained rather than weeks on the calendar, so a fortnight away for work does not spend it while you are not there. What comes off in that week, and what deliberately does not, is in the week you back off.