How training programs are built

The ideas every program in this section is made of, in plain language.

If you have ever looked at a training program and wondered why it says six sets of two rather than three sets of five, this article is the answer. Programs are not arbitrary. Every one of them is navigating the same handful of constraints, and once you can see those constraints, the schemes stop looking like magic numbers and start looking like choices.

What follows is the shared vocabulary. The program articles lean on it rather than re-explaining it each time.

Overload and adaptation

Your body changes in response to demands it is not already comfortable with. Train at a level you have fully adapted to and you maintain. Train slightly beyond it, recover, and you come back a little more capable. That is the whole engine, and everything else is detail about how to apply the demand and how to recover from it.

The catch is that the target moves. What overloaded you in January is maintenance by March. So training has to keep getting harder, and "harder" can mean several different things:

Load. More weight on the bar.
Volume. More total work: more sets, more reps, more sessions.
Density. The same work in less time, usually by cutting rest.
Proximity to failure. The same sets, taken closer to the point where you could not do another rep.

Most programs move one or two of these at a time and hold the rest still. That is deliberate. If everything changes at once you cannot tell what worked.

Volume and intensity, and why they trade off

Intensity, in a lifting context, means how heavy the weight is relative to your best single. Volume means how much work you do. The two pull against each other: the heavier you go, the fewer quality sets and reps you can accumulate before performance falls apart.

This is the central constraint every program navigates, and it is why so many of them look different from each other. A program that wants size tends to buy volume and pay for it with a lighter load. A program that wants a bigger single tends to buy intensity and pay for it with less total work.

Both directions have support. For muscle growth there is a reasonably graded relationship between weekly set count and results, at least up to a point (Schoenfeld and colleagues, 2017). For strength, the dose that works best depends heavily on training history, with experienced lifters generally needing more, and heavier, work than beginners (Rhea and colleagues, 2003). And load itself turns out to be less decisive for size than most people assume: similar growth shows up across a wide range of loads when sets are taken close enough to failure, though maximal strength still favours heavy training (Schoenfeld and colleagues, 2017).

Training frequency mostly acts as a lever on this trade-off rather than an independent variable. Spreading the same weekly volume across more sessions lets you do more of it at a decent quality, but once total volume is held equal, frequency by itself does much less than people expect (Grgic and colleagues, 2018).

Fatigue and recovery

A hard session does two things at once. It nudges your long-term capability upward, slowly, and it drops your short-term performance, sharply. What you can lift on any given day is roughly the first minus the second.

This is the fitness-fatigue idea, and the useful part is that the two decay at different rates (Banister and colleagues, 1975). Fatigue is large but fades fast. Fitness is smaller but sticks around. So if you train hard for three weeks and then back off, fatigue drains away while most of the fitness stays, and you test higher than you could have at any point during the block.

That is why a hard block gets lighter before a test, rather than heavier. You are not adding anything in that final stretch. You are letting what you already built become visible.

Periodisation

Periodisation just means planning how training changes over time instead of doing the same thing indefinitely. Three patterns cover most of what you will meet:

Linear. Volume falls and intensity climbs across the block. Lots of moderate work early, less but heavier work later. The Russian Squat Program is close to a textbook example.
Block. Distinct phases, each chasing one quality, sequenced so each sets up the next. Often an accumulation phase, then an intensification phase, then a peak.
Undulating. The hard and easy days rotate inside each week rather than across months. The Texas Method is the clearest example there is: one volume day, one light day, one heavy day, every week.

Planned variation generally beats no plan at all for building maximal strength (Williams and colleagues, 2017). Which pattern you pick matters much less. Comparisons between linear and undulating models keep coming back roughly level for muscle growth (Grgic and colleagues, 2017). The honest summary is that structure helps, and the specific flavour of structure is mostly a question of what fits your week and what you will actually stick to.

Percentages, one-rep maxes and training maxes

When a program says 80%, it means 80% of your one-rep max: the heaviest single you could manage on that lift. Percentages exist so a scheme can be written once and scale to any lifter.

Two complications. First, most people are not testing a true max every few weeks, so the number gets estimated from sets you actually did, usually by a formula that maps reps at a given weight onto a predicted single (Brzycki, 1993). Estimates are good enough to program from and are not the same as a tested max. They drift, they are less accurate the further the set is from a single, and they are optimistic for some people and pessimistic for others.

Second, a lot of programs deliberately run off a training max instead: a number set slightly below your real one, often around 90%, and then held fixed for the whole block. It sounds like a fudge and it is a good one. Percentages of a slightly conservative number mean the prescribed weights stay achievable even on an average day, which keeps the scheme running instead of stalling in week two. Peaking programs are the exception. Cycles like the Russian Squat Program or Smolov Jr are written against your actual current max, which is exactly why they demand an honest and recent one.

Progressive overload in practice

Progression happens at three different timescales, and programs differ mainly in which one they use.

Session to session is the beginner pattern: add a small amount every time you train the lift. It works, right up until it does not, and it fails suddenly rather than gradually.

Week to week is the intermediate pattern. You cannot recover from one session to the next any more, so the week becomes the unit. You beat last week rather than last session.

Block to block is where most experienced lifters end up. Progress within a block is planned in advance and may not be monotone at all. The block as a whole is what moves you forward, and the comparison that matters is this block against the last one.

The reason "add 2.5 kg forever" ends is simply that adaptation slows as you get closer to your ceiling, while the demand needed to trigger it keeps rising. The two curves cross. Nothing has gone wrong when that happens, and the fix is a longer planning horizon rather than more effort.

Specificity, and what it costs

You adapt to what you actually do. Squat three times a week and you get better at squatting, partly through muscle and partly through skill: bracing, bar path, timing, confidence under load.

This is why narrow, single-lift blocks work so well. It is also why they cannot be a permanent way of training. Concentrating everything on one lift means everything else is, at best, being maintained. Recovery is finite, so specialising in one place is a decision to under-serve another. Sustained long enough, that shows up as weak points and a narrower base to build the next block on.

The practical version: specialise deliberately, for a defined stretch, then broaden out again.

Deloads, peaking and testing

A deload is a planned easy week. Volume drops, intensity often drops a little, and the point is to let fatigue clear while keeping the movement pattern warm. Taken before you need it, a deload costs almost nothing. Taken after you have already stalled, it costs you the weeks you spent stalling.

Peaking is the same mechanism aimed at a date. Work tapers in the final stretch of a block so that fatigue is at its lowest when you want performance at its highest.

A test week is what that peak is for. It converts a block of training into a number you can plan the next block from. That is its real job: not a celebration, but a fresh, honest input. A block run off a stale max is a block run at the wrong weights.

How close to failure you train, day to day, sits underneath all of this. Training nearer to failure adds fatigue quickly, and the evidence suggests the extra growth you buy for it is modest once sets are already reasonably hard (Refalo and colleagues, 2023). Most well-built programs leave a rep or two in reserve on most sets, and spend the trip to failure sparingly.

How Endeva applies this

Endeva builds training two ways.

The first is a generated program, built around your goal, your experience, the days you have and the equipment you can reach. Its weights anchor to what you have actually logged rather than to what you once managed, using a recent window of your training so the numbers track your current form. The program is then scheduled into your weekly plan, and it adapts: if the last few weeks say the prescription is too much, what gets served moves accordingly.

The second is a named program. These run their own published scheme, and the numbers are worked out from your training max at the start and then held for the whole block. That is intentional. A cycle like the Russian Squat Program is not a smooth ramp, so quietly "holding you back a step" would serve you a different session rather than an easier one. Named blocks are meant to be run as written, and Endeva tells you where you are in the cycle rather than rewriting it underneath you. When a block ends, your training max is recalculated from your recent data, including anything you hit on the test day, and the next block starts from there.

Both routes end up in the same weekly plan, and both give you the option of moving sessions around when the week does not cooperate.

References

Rhea, M. R., Alvar, B. A., Burkett, L. N., & Ball, S. D. (2003). A meta-analysis to determine the dose response for strength development. Medicine & Science in Sports & Exercise.
Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2017). Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences.
Schoenfeld, B. J., Grgic, J., Ogborn, D., & Krieger, J. W. (2017). Strength and hypertrophy adaptations between low- versus high-load resistance training: a systematic review and meta-analysis. Journal of Strength and Conditioning Research.
Grgic, J., Schoenfeld, B. J., Davies, T. B., Lazinica, B., Krieger, J. W., & Pedisic, Z. (2018). Effect of resistance training frequency on gains in muscular strength: a systematic review and meta-analysis. Sports Medicine.
Williams, T. D., Tolusso, D. V., Fedewa, M. V., & Esco, M. R. (2017). Comparison of periodized and non-periodized resistance training on maximal strength: a meta-analysis. Sports Medicine.
Grgic, J., Mikulic, P., Podnar, H., & Pedisic, Z. (2017). Effects of linear and daily undulating periodized resistance training programmes on measures of muscle hypertrophy: a systematic review and meta-analysis. PeerJ.
Refalo, M. C., Helms, E. R., Trexler, E. T., Hamilton, D. L., & Fyfe, J. J. (2023). Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine.
Banister, E. W., Calvert, T. W., Savage, M. V., & Bach, T. M. (1975). A systems model of training for athletic performance. Australian Journal of Sports Medicine.
Brzycki, M. (1993). Strength testing: predicting a one-rep max from reps-to-fatigue. Journal of Physical Education, Recreation & Dance.