v1.1 to v1.1

- > technique, spotting, or safe equipment (see the calibration protocol below).

- ### 1. Weekly volume: diminishing returns, no hard ceiling — count fractional sets

-

- Pelland et al. (2025, https://doi.org/10.1007/s40279-025-02344-w) find hypertrophy

- rises with weekly volume with diminishing returns and no plateau found; count

- fractional sets (direct sets 1, indirect sets 0.5):

-

- - Schoenfeld et al. (2017) quantified the dose-response at an average effect

- size of 0.023 per additional weekly set (~0.37% additional muscle growth

- per set) — roughly linear at low volumes, flattening at high volumes as

- recovery limits bind.

- - Baz-Valle et al. (2022) reported the same flattening pattern at high

- volumes, consistent with diminishing returns rather than a hard cutoff.

- - Aube et al. (2022, RCT, https://doi.org/10.1519/JSC.0000000000003524)

- compared 12, 18, and 24 sets/week and found no difference in muscle

- thickness by set number.

-

- The practical reading: the first 10–12 sets deliver most of the hypertrophic

- stimulus; sets beyond that trade an increasingly small stimulus gain for a

- disproportionate recovery cost.

-

- **This volume recommendation assumes high training intensity** (RPE 8–10,

- 0–2 RIR — see below). At submaximal intensity, higher volumes are needed to

- compensate. For experienced trainees, moderate volume at high intensity tends

- to outperform high volume at moderate intensity.

-

- ### 2. Intensity: closer to failure appears better than far from failure (exploratory evidence)

-

- Proximity to failure appears to matter as much as, or more than, absolute

- volume for experienced trainees:

-

- - Refalo et al. (2022, https://doi.org/10.1007/s40279-022-01784-y) found no

- benefit of momentary failure itself (ES 0.12, p=0.34).

- - Robinson et al. (2024) found hypertrophy improves the closer training gets

- to failure; the proximity analysis was exploratory with estimated RIR.

- - Mechanical tension — believed to be the primary driver of hypertrophy (see

- below) — reaches its maximum only at high intensity.

-

- Working ranges: RPE 8–10, or 0–2 RIR (Reps in Reserve; RPE = 10 − RIR on the

- standard scale), producing a strong

- growth stimulus without excessive central-nervous-system fatigue. The

- practical implication is that moderate volume (12–15 sets) at high intensity

- (RPE 8–9) is often more effective for an experienced trainee than high volume

- at submaximal intensity.

-

- ### 3. Session distribution: the PUOS ceiling (~11 fractional sets/session)

-

- "Point of Undetectable Outcome Superiority" (PUOS; Remmert et al. 2025,

- SportRxiv preprint) is the per-session volume beyond which additional sets

- have less than a 50% probability of producing a detectably larger

- hypertrophy effect — estimated at roughly **11 fractional sets per session**

- (direct sets count 1, indirect sets count 0.5; about 8 direct sets).

- Returns diminish before the ceiling rather than falling off a cliff, and the

- estimate carries growing uncertainty at high volumes, so treat it as a soft

- ceiling rather than a hard limit.

- Practical consequence (expert heuristic): distributing a given weekly volume

- across several sessions tends to work better in practice than concentrating

- it — e.g. 2×10 sets across two sessions rather than 20 sets in one. Direct

- evidence on frequency itself is weak (see section 6), so this rule rests on

- the per-session dose-response plus coaching practice, not on a measured

- frequency effect.

-

- ### 4. The Stimulus:Fatigue ratio as the primary metric

-

- Rather than treating a volume number as an end in itself, the Stimulus:Fatigue

- ratio — the balance between the adaptive stimulus a session produces

- (mechanical tension, metabolic stress, muscle damage) and the systemic fatigue

- it accumulates — is proposed as the metric that should actually drive volume

- and intensity decisions.

-

- **Worsens the ratio (more fatigue per unit of stimulus):**

- - Very high volume (>8 direct sets per muscle group per session, about 11 fractional sets — the PUOS ceiling above)

- - Training multiple sets to 0 RIR / failure

- - High frequency (>3×/week per muscle group; expert heuristic — Pelland et al. 2025 find no consistent independent frequency effect on hypertrophy)

- - Exercises with a large stretch load (extra damage per unit of stimulus —

- a cost worth paying given the hypertrophy benefit; see section 7)

- - Fast-twitch-dominant individuals

-

- **Improves the ratio (less fatigue per unit of stimulus):**

- - Moderate volume (2–6 sets per muscle group per session)

- - Training with 1–2 RIR reserve

- - Adjusted frequency (1.5–2.5×/week; expert heuristic, same caveat as above)

- - Balanced exercise selection

- - Auto-regulation protocols (Part B)

-

- Advanced trainees often do better with lower volume and a better ratio than

- with maximal volume and a poor one. Individual recovery capacity should set

- the target ratio — volume ranges are starting points to individualize, not

- individual prescriptions.

-

- ### 5. Volume by training experience

-

- The rows below Advanced are context for scaling down, not programming advice

- for beginners or intermediates (this skill does not serve them).

-

- | Level | Working volume | Note |

- |---|---|---|

- | Beginner / limited recovery | 1–3 sets/muscle group/workout | Already adapts to minimal doses; more volume mostly adds fatigue, not stimulus |

- | Intermediate | 2–4 hard sets/workout (standard); or 4–6 sets across 2 exercises; or 6–8 sets across 3–4 exercises at higher RIR | At 4–6 sets: lower reps + higher RIR, or reduce frequency to 1.5–2×/week |

- | Advanced | 4–6 hard sets; up to 8–10 sets across 3–4 exercises; or lower volume at higher frequency | Often benefits more from lower volume with a better Stimulus:Fatigue ratio than from maximal volume |

-

- At 8+ sets, 2+ RIR reserve becomes effectively mandatory for adequate

- recovery — higher volume forces a larger RIR buffer.

-

- ### 6. Frequency and periodization

-

- Pelland et al. (2025) find no consistent independent effect of weekly

- frequency on hypertrophy once volume is accounted for — the effect is small

- and compatible with negligible, while higher frequency does benefit

- strength. Treat every frequency rule below as an expert heuristic for

- managing per-session volume and recovery, not as a measured frequency

- optimum.

-

- Optimal frequency per muscle group is set by individual recovery

- determinants (fiber-type dominance, age, training experience, sleep,

- nutrition, stress, and the session's own Stimulus:Fatigue ratio), not by an

- abstract "3–5×/week" figure from the literature. For higher frequency

- (3×/week), lower the reps, lower the volume per session (≤3 sets), raise RIR

- reserve (2+), or favor less fatiguing exercise variants. For lower frequency

- (1–2×/week), the opposite combination — higher volume per session, closer to

- failure, higher reps — is appropriate. When progress stalls, add rest days

- before adding volume; when volume rises, frequency should fall to compensate.

-

- Two periodization strategies apply this over time:

-

- - **Linear periodization** — intensity rises and volume falls across a cycle

- (typically 4–12 weeks). Simple to plan and track; can leave the trainee

- under-exposed to other training qualities for long stretches.

- - **Undulating periodization** — volume and intensity vary within the week

- (e.g. heavy/low-volume, moderate, light/high-volume days). More varied

- stimulus, at the cost of being harder to plan and track. Moesgaard et al.

- (2022) find no hypertrophy difference between linear and undulating

- schemes (or between periodized and non-periodized training) when volume is

- equated; the undulating advantage appears for maximal strength, mainly in

- trained lifters — so choose between them on preference and strength goals,

- not on expected hypertrophy.

-

- **Volume cycling** (expert heuristic) is a concrete undulating

- implementation: an accumulation phase (4–6 weeks) at 12–15 sets/muscle

- group, an intensification phase (2–3 weeks) at 16–20 sets, then a 1-week

- deload at 6–8 sets. The "growth stagnates within about 3 months without

- variation" and "~20% volume increase between cycles is optimal" figures are

- coaching rules of thumb, not measured optima — use them as defaults to

- individualize, not as targets. Coleman et al. (2024) find a mid-block week

- off leaves hypertrophy unchanged while slightly reducing strength gains and

- shows no potentiation effect, so schedule deloads by need (persistent

- performance drop, unrecovered soreness, rising RIR error) rather than by the

- calendar; continuous training over blocks of up to about 9 weeks is a viable

- default. The plateau test in Part B stays the arbiter: when in doubt, test

- fatigue versus stimulus rather than deloading on schedule.

-

- ### 7. Rest intervals and long muscle lengths

-

- Rest at least 60 seconds between sets; Singer et al. (2024) find a small

- hypertrophy benefit to rest beyond 60 seconds, with no appreciable further

- benefit past about 90 seconds, likely mediated by preserved volume load.

- Hypertrophy happens across a wide rest spectrum, and training to failure or

- not does not meaningfully change the picture — so rest 60–90 seconds minimum

- on isolation work and longer (2–3 minutes or more) on heavy compounds where

- short rest would cost reps, without timing longer rests for hypertrophy's

- sake.

-

- Emphasize the lengthened position: prior work finds greater hypertrophy

- training at long versus short muscle lengths, and Wolf et al. (2025) find

- lengthened partials match full range of motion in trained lifters — so a

- full range of motion with a controlled stretch, or lengthened partials as an

- alternative, both satisfy the requirement. The stretch imposes extra damage,

- which is why section 4 lists it as a fatigue cost, but the net trade favors

- including it rather than avoiding it.

-

- ### Physiological foundation (why these levers matter)

-

- Three mechanisms drive hypertrophy, in descending order of importance:

- **mechanical tension** (the primary driver — the force muscle must produce

- against a load; maximized by progressive overload) > **metabolic stress**

- (metabolite accumulation, the "pump", driving hormonal and cell-swelling

- responses) ≥ **muscle damage** (micro-trauma from eccentric loading and novel

- movement patterns, triggering repair/adaptation). This is why intensity

- (mechanical tension near failure) anchors the recommendations above rather

- than volume alone.

- Auto-regulation lets a session's actual volume emerge from real-time

- performance instead of a fixed prescribed number of sets — a direct

- application of the Stimulus:Fatigue ratio. All three protocols below assume

- an accurate sense of RIR; see the calibration step first if that is in doubt.

-

- ### Prerequisite: RIR calibration (single working set)

-

- Most trainees systematically underpredict proximity to failure by about 1

- rep (Halperin et al. 2022) — enough to turn a programmed 1 RIR into an

- actual 2 RIR. Accuracy is worse on high-rep sets (above about 12 reps) and

- better near failure, on heavier lower-rep sets, and in later sets, so treat

- early-set high-rep RIR calls as the least trustworthy. Before relying on any

- auto-regulation protocol, recalibrate:

-

- 1. Use a single working set per exercise.

- 2. Choose safe exercises (machines, dumbbells, a power rack with safeties) —

- true failure without experience carries injury risk.

- 3. Aim for true muscular failure (0 RIR).

- 4. Hold this for 3–4 weeks, then add volume gradually (1–2 sets per

- progression) once RIR estimation is accurate.

-

- This is especially worth repeating after a long layoff or when switching to

- unfamiliar exercises.

-

- ### The three protocols

-

- - **5% Fatigue Rule**

- - Best fit: Heavy compounds, 1–6RM, plates fine enough to drop ~5%

- - Stop criterion: Start set at 1 RIR; drop load ~5% and repeat the same rep count; keep dropping until 1 RIR is reached again — then stop

- - Worked example: 100kg×4 @1RIR → 95kg×4 @2RIR (still light) → 95kg×4 @1RIR → **stop**

- - **Rep Drop**

- - Best fit: Moderate-to-high reps, 6–15+RM, where fine load jumps aren't practical

- - Stop criterion: Start set at 1 RIR; keep the same load; continue until reps fall 2 below the starting set's rep count — then stop. Safety cap: even with exceptional work capacity, stop at a maximum of 5 sets regardless of rep reduction

- - Worked example: 80kg×10 @1RIR → 80kg×9 @1RIR → 80kg×9 @1RIR → 80kg×8 (−2 reps) → **stop**

- - **Myo-Reps**

- - Best fit: Time-efficient work using an activation set + mini-sets

- - Stop criterion: Perform an activation set, then mini-sets at 0–1 RIR; stop when a mini-set falls 1 rep below the *initial* mini-set. Failure on the very last mini-set is common and acceptable, since volume is already auto-regulated

- - Worked example: 80kg×10 (activation) + 4 + 4 + 3 (1 rep below the first mini-set) → **stop**

-

- Rough volume equivalence for Myo-Reps: one Myo-Rep set (5–15 reps after

- activation) ≈ 2–4 traditional sets; 1–2 Myo-Rep sets (15–25 reps after

- activation) ≈ 4–6 traditional sets.

-

- All three share the same logic: a specific, observable drop in performance

- (load tolerated, reps completed, or mini-set reps) signals accumulated fatigue

- and serves as a built-in volume limiter — replacing a fixed, pre-decided set

- count with a real-time readout of the Stimulus:Fatigue ratio.

-

- ### Plateau diagnosis: fatigue problem or stimulus problem

-

- When progress stalls for 3–4 weeks, do not guess whether the fix is more or

- less training — test it. Applying the wrong fix (more volume to an

- over-fatigued trainee, or less volume to an under-stimulated one) is common

- and can delay progress by months.

-

- ```

- 3-4 weeks of stagnation

- │

- ▼

- Phase 1 (1-2 weeks): increase rest days / reduce frequency,

- keep intensity and per-session volume unchanged

- │

- ├── Progress returns ──▶ FATIGUE problem

- │ → reduce volume and/or frequency

- │ durably (trade one for the other)

- │ → deload when need signals show it (see Part A.6),

- │ rather than on a fixed 4–6 week cycle

- │

- └── No progress ──────▶ STIMULUS problem

- → train closer to failure (lower RIR)

- → increase volume gradually

- → introduce exercise variety

- (e.g. shift from compound to

- isolation exercises to raise the

- Stimulus:Fatigue ratio and reach

- under-recruited fibers/regions)

- ```

-

- Volume cycling (Part A.6) is the preventive version of this test — cycling

- volume down periodically before a genuine plateau forces the diagnosis.

- ### C.1 — Nine modifications while risk is elevated

-

- This is not rehabilitation (for that, see C.2). It is a normal hypertrophy

- program run under conditions that push injury risk up: an irritated joint,

- heavy sleep debt, high life stress, a return after a layoff, or a phase that

- has already driven fatigue high. The trade-off is explicit and worth stating

- plainly — these modifications cost growth. They are the right trade when

- other variables are already raising risk.

-

- | # | Modification | Why |

- |---|---|---|

- | 1 | **Cap load at 70% 1RM** — equivalently, never go below ~15RM on any exercise | Removes the load range where a technique breakdown does the most damage |

- | 2 | **Full pause at every direction change of every rep** — e.g. on a pulldown, pause at the top in the stretch *and* at the bottom with the bar at the upper chest | Peak forces are highest in the eccentric→concentric transition; a full pause removes the rebound that generates them |

- | 3 | **Tempo ~3 s eccentric, ~2 s concentric** | Holds technique together under fatigue and prevents force spikes |

- | 4 | **Train the mind-muscle connection deliberately** | On its own this lowers the load used and raises the Stimulus:Fatigue ratio (Part A.4) without adding risk |

- | 5 | **End accumulation phases at ~⅔–¾ of MRV** | If MRV is unknown: that volume usually coincides with the point where sessions start producing very strong pumps and a lot of soreness — when that shows up, deload |

- | 6 | **Progress reps, not load,** week to week | Keeps stimulus progression running without buying strength gains at a risk premium |

- | 7 | **Favor machines over free weights** | More stability, fewer technique deviations, and fewer force spikes spent correcting them |

- | 8 | **Leave at least 2 RIR** | Very low RIR produces instability under the bar. Partly follows already from the shortened accumulation in #5 |

- | 9 | **Add sets very conservatively** — where you would ideally add two, add one | Rapid volume increases are a documented injury-risk driver |

-

- Run together, the nine produce a program with very low injury risk and a real

- but submaximal growth effect. They are a package for a period, not a

- permanent style.

-

- **Conflict with Part A, resolved.** Part A.2 puts the working range at 0–2

- RIR; C.8 requires ≥2 RIR, and C.1 caps load where Part A assumes heavier

- work. This is deliberate, not an inconsistency: **Part A is the normal case,

- Part C overrides it for as long as the elevated-risk condition holds.** When

- the condition clears, Part A's ranges resume. Do not blend the two — running

- Part A's intensity with Part C's exercise selection gets the cost of both and

- the benefit of neither.

-

- ### C.2 — Returning to training after an injury

-

- Physical therapy targets *normal function*: sitting, stairs, carrying

- groceries. For a trainee the injury is not resolved until they are back in

- the gym and can safely run progressive stimulus increases again. PT usually

- stops before that point, and this progression covers the gap — it does not

- replace the therapy. Re-read the scope and safety note above before using it:

- completed PT and medical clearance are preconditions, and a clinician's

- advice overrides anything here.

-

- - **1. Finish PT**

- - What: Complete physical therapy as prescribed

- - Load / intensity: —

- - Gate to the next phase: Cleared for most activities of daily living

- - **2. Occluded isolation**

- - What: Occlusion training, isolation only. Start with **1 set** in the first session; target muscle at most **3×/week**; only as much ROM as is pain-free. Raise set count slowly, but soreness must clear between sessions — especially at the injury site. Skip this phase for muscles that cannot be occluded (e.g. pecs)

- - Load / intensity: **~20% 1RM**, very slowly toward ~30%, **≥3 RIR**

- - Gate to the next phase: 30% 1RM reached

- - **3. Short-rest isolation + ROM increases**

- - What: Drop occlusion, keep isolation. Rest only long enough for the metabolite burn to clear. 2–3 sessions/week with full recovery between them. Widen ROM gradually

- - Load / intensity: **30 → 50% 1RM**; first working set **~25+ reps**; toward the end of the phase down to **1 RIR**

- - Gate to the next phase: Full or near-full joint ROM at minimal discomfort

- - **4. Add compounds**

- - What: Bring compounds in (e.g. leg press or squat for quads). Full pauses between eccentric and concentric; prioritize stability. Isolation work can be cut back or dropped — **if kept, put it before the compound** in the session so less load is needed on the compound

- - Load / intensity: up to **~60% 1RM**, i.e. first sets at **~15–20 reps**

- - Gate to the next phase: 60% 1RM with clean technique and minimal to no discomfort

- - **5. Load increases**

- - What: Raise load on the compounds slowly and steadily

- - Load / intensity: toward **10RM**; takes **at least a month** from the end of Phase 4

- - Gate to the next phase: 10RM across several sets with no symptoms of the old injury

- - **6. Normal training**

- - What: Regularly programmed training (Parts A and B)

- - Load / intensity: —

- - Gate to the next phase: —

-

- The same progression as a load ladder — read left to right, one column at a

- time:

-

- ```

- PHASE 2 PHASE 3 PHASE 4 PHASE 5 PHASE 6

- Load %1RM 20 ──▶ 30 30 ──▶ 50 50 ──▶ 60 60 ──▶ 10RM normal

- RIR >= 3 3 ──▶ 1 1-2 1-2 0-2

- ROM pain-free widening full full full

- Exercise isolation isolation + compounds compounds all

- (occluded) (short rest)

- Frequency <= 3x/wk 2-3x/wk normal normal normal

-

- Gate 30% 1RM full ROM, 60% 1RM, 10RM, no —

- reached minimal clean old-injury

- discomfort technique symptoms

- ```

-

- **Time horizon.** For an average injury involving surgery or serious

- rehabilitation, expect **6–12 months** back to normal training. The lost

- muscle itself is largely back much sooner — roughly **3 months** into this

- process; everything after that is new growth. Knowing this ahead of time is

- what keeps the middle phases from feeling like wasted work.

-

- **The transferable pattern**, worth keeping even when the protocol is not

- followed literally: *isolation → compound, high RIR → low RIR, low load →

- high load, restricted ROM → full ROM.* Loosen **one variable at a time**,

- with the order fixed in advance rather than decided in the moment. The gates

- in the phase list are what make that enforceable; without them the variables all

- loosen at once on the first good day.

- - **Skipping RIR calibration.** Every auto-regulation protocol above depends