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Every claim behind the plan, with its authority and page reference. Search by id, author, or text.

BJ-001Bryan Johnson

Blueprint's headline prescription is 6 hours of exercise per week.

protocol.bryanjohnson.com §Exercise
BJ-002Bryan Johnson

The 6 weekly hours break down as 3 sessions of strength training plus 3 sessions of cardio.

protocol.bryanjohnson.com §Exercise
BJ-003Bryan Johnson

Cardio target: 150 minutes per week of moderate (Zone 2) activity at an intensity where conversation is still possible.

protocol.bryanjohnson.com §Exercise
BJ-004Bryan Johnson

High-intensity target: 75 minutes per week of vigorous exercise (unable to converse, e.g. HIIT) — stated as a minutes floor, not a session count, and never labeled "zone 5".

protocol.bryanjohnson.com §Exercise
BJ-005Bryan Johnson

Flexibility, balance, and mobility exercises are instructed to be included, with no weekly frequency or minutes quantity stated.

protocol.bryanjohnson.com §Exercise
BJ-006Bryan Johnson

Johnson personally does a 60-90 minute workout each morning covering balance, flexibility, strength training, and cardio.

protocol.bryanjohnson.com §My daily routine
BJ-007Bryan Johnson

He breaks sedentary time with roughly 2-3 minutes of light activity (walking, bodyweight work, stretching) every 30 minutes.

protocol.bryanjohnson.com §My daily routine
BJ-008Bryan Johnson

He stays active for 5-10 minutes after each meal.

protocol.bryanjohnson.com §My daily routine
BJ-009Bryan Johnson

The sample week schedules strength training on days 1, 3, and 5 (3 days/week) at 45-60 minutes per session.

blueprint.bryanjohnson.com/blogs/news/exercise-and-fitness-protocol-for-longevity §Days 1/3/5
BJ-010Bryan Johnson

Zone 2 is defined as 60-70% of max heart rate — conversational but still exerting.

blueprint.bryanjohnson.com/blogs/news/exercise-and-fitness-protocol-for-longevity §Zone 2 cardio
BJ-011Bryan Johnson

High-intensity interval work appears on 3 days of the sample week (days 2, 4, and 6), including a day-4 session of 8-10 rounds of 60 seconds above 90% max HR with 60 seconds active recovery.

blueprint.bryanjohnson.com/blogs/news/exercise-and-fitness-protocol-for-longevity §Days 2/4/6
BJ-012Bryan Johnson

Day 6 is the Norwegian 4x4: 4 rounds of 4 minutes at 85-95% max HR followed by 3 minutes at 60-70% max HR, on treadmill or indoor bike.

blueprint.bryanjohnson.com/blogs/news/exercise-and-fitness-protocol-for-longevity §Day 6 Norwegian protocol
JD-001Jack Daniels

VDOT is a single fitness number computed from a race result — oxygen cost at race velocity (VO2 = −4.60 + 0.182258·v + 0.000104·v²) divided by the fraction of VO2max sustainable for that race duration — so one honest race time sets every training pace.

vendor/runcoach/vdot.ts verified vs published tables
JD-002Jack Daniels

The engine backing these numbers reproduces Daniels' published race-equivalence table (5K 19:57 = 10K 41:21 = HM 1:31:35 = M 3:10:49 = VDOT 50.0) and matches the Table 5.2 pace zones at VDOT 50 with 0-second deltas on all five zones.

vendor/runcoach/verify-vdot.ts run 2026-06-11, all checks passed
JD-003Jack Daniels

Each training zone is a fixed %VO2max (E 59–74%, M 75–84%, T 83–88%, I 95–100%, R 105–110%); the zone pace is the velocity that elicits that oxygen cost at your current VDOT, so all five paces move together when VDOT changes.

vendor/runcoach/vdot.ts verified vs published tables
JD-004Jack Daniels

E (Easy) is conversational aerobic running at 59–74% VO2max (engine midpoint 67.8%) — at VDOT 50 the book band is 4:56–5:34/km — and it is the default intensity for all non-quality mileage.

vendor/runcoach/vdot.ts verified vs published tables
JD-005Jack Daniels

M (Marathon) is steady marathon-race-pace running at 75–84% VO2max (engine midpoint 81.7%), 4:31/km at VDOT 50.

vendor/runcoach/vdot.ts verified vs published tables
JD-006Jack Daniels

T (Threshold) is "comfortably hard" running pinned to the lactate threshold (~4 mmol/L, roughly 1-hour-race effort) at 83–88% VO2max (engine midpoint 88.1%), 4:15/km at VDOT 50.

vendor/runcoach/vdot.ts verified vs published tables
JD-007Jack Daniels

I (Interval) is hard repeat work at 95–100% VO2max (engine midpoint 97.4%) — i.e. at or near the velocity at VO2max — 3:55/km at VDOT 50.

vendor/runcoach/vdot.ts verified vs published tables
JD-008Jack Daniels

R (Repetition) is short fast repeats above VO2max pace at 105–110% (engine midpoint 107.8%), ~3:36/km at VDOT 50, run for speed and economy with full recoveries rather than aerobic load.

vendor/runcoach/vdot.ts verified vs published tables
JD-009Jack Daniels

Sam's 5K 22:00 computes to VDOT 44.5 (vdotFromRace(parseRace("5K 22:00")) = 44.54), which also implies ~45:40 10K and ~1:41 half-marathon equivalents at current fitness.

vendor/runcoach/vdot.ts computed from intake running.recent_5k
JD-010Jack Daniels

Sam's E (Easy) band at VDOT 44.5 is roughly 5:20–6:25/km (59–74% VO2max edges computed as 5:22–6:26/km, engine midpoint 5:45/km); note this is the computed physiological band — the book's printed Table 5.2 E bands trim the slow edge tighter, so treat ~6:25 as a ceiling for genuinely easy days, not a target.

vendor/runcoach/vdot.ts computed from intake running.recent_5k
JD-011Jack Daniels

Sam's T (Threshold) pace at VDOT 44.5 is 4:40/km (7:31/mi) — comfortably hard, not a time trial.

vendor/runcoach/vdot.ts computed from intake running.recent_5k
JD-012Jack Daniels

These bands inherit the input's uncertainty: the 22:00 5K is Sam's own "ambitious" estimate, not a timed result, so the first properly timed 5K (or a race) should re-anchor VDOT before any pace is treated as precise.

vendor/runcoach/vdot.ts computed from intake running.recent_5k
JD-013Jack Daniels

Sam's 7.5 km Wednesday/Saturday club runs are E-zone sessions and should sit inside ~5:20–6:25/km unless the plan explicitly schedules a quality session — running them at club-social pace near or below 5:00/km puts them in his M/T zones and silently converts recovery volume into unplanned hard days.

vendor/runcoach/vdot.ts computed from intake running.recent_5k
SF-001Pavel Tsatsouline

Reactivity and resistance trade off inversely — a new or heavier stimulus makes the body highly responsive but easy to overtrain, and holding a load raises resistance while responsiveness fades, which is why load must be cycled rather than held flat.

pd-manual p.3 (pdf 9) §Reactivity and resistance to a load
SF-002Pavel Tsatsouline

Adaptation is triggered by repeating the same stimulus in a strict rhythm (same days, same exercises, fixed intervals); constantly varied stimuli are read as "static" and produce no system-wide response.

pd-manual p.2 (pdf 8) §Continuity
SF-003Pavel Tsatsouline

Training must be simultaneously the same (continuity + specificity) and different (law of accommodation), and accommodation is overcome only by a qualitative or quantitative change.

pd-manual p.2 (pdf 8) §Accommodation
SF-004Pavel Tsatsouline

Make quantitative changes (volume, intensity) every session but qualitative changes (exercises, methods) only every mesocycle; a sound program keeps many constants and a limited number of variables.

pd-manual p.3 (pdf 9) §Accommodation
SF-005Pavel Tsatsouline

Share of competition-lift practice scales with level — beginner 100%, intermediate 70-80%, advanced up to 50% — and the ratio is shifted each mesocycle.

pd-manual p.4 (pdf 10) §Specificity
SF-006Pavel Tsatsouline

Daily NL (number of lifts) per exercise class at ≥70% 1RM: 10-20 minimal, 20-30 optimal, 30-50 maximal.

pd-manual p.5 (pdf 11) §Volume
SF-007Pavel Tsatsouline

90% 1RM builds strength fastest but the gains are unsustainable, whereas 80% 1RM develops more strength over the long term.

pd-manual p.6 (pdf 12) §Intensity
SF-008Pavel Tsatsouline

1-6 reps is the optimal strength range; minimize singles and doubles, favor triples/fours when hypertrophy is unwanted and fives/sixes when it is wanted.

pd-manual p.12 (pdf 18) §Reps and effort
SF-009Pavel Tsatsouline

Effort distribution: most volume sits at RPE 6-8, only 5-10% at RPE 8-9, and RPE 9-10 (1RM tests / PR attempts) is used no more than 2-3 times per year.

pd-manual p.14 (pdf 20) §Reps and effort
SF-010Pavel Tsatsouline

%1RM enables precise planning but ignores the athlete's daily psychophysical state; RPE/RIR adapts the day's load to sleep, stress, and life factors — plan with %1RM, react with RPE/RIR.

pd-manual p.14 (pdf 20) §RPE/RIR vs. % 1RM
SF-011Pavel Tsatsouline

Terminate a set at the first "stop sign": rep speed slows, tempo or inter-rep pauses lengthen, or technique changes in any way.

pd-manual p.15 (pdf 21) §Stop Signs
SF-012Pavel Tsatsouline

The training max is the heaviest weight liftable without strong emotional excitation; if heart rate rises before the set, the weight is above today's TM.

pd-manual p.6 (pdf 12) §Intensity
SF-013Pavel Tsatsouline

The TM can be lifted every session (up to ~6 top lifts) and for elite lifters is ~85-90% of competition max, while >90% 1RM attempts are psychophysical stress that delay progress or cause overtraining if overused — train the TM, test the 1RM rarely.

pd-manual p.6 (pdf 12) §Intensity
SF-014Pavel Tsatsouline

If a single exercise's daily load exceeds NL 30 or 30 minutes, split it with unrelated exercises or ≥30 min passive rest, and prefer short sessions because free-radical damage peaks toward the end.

pd-manual p.22 (pdf 28) §Rest
SF-015Pavel Tsatsouline

A macrocycle spans several months to 4 years; the US powerlifting model runs 8-16 weeks of sequenced mesocycles leading to a competition.

pd-manual p.27 (pdf 33) §Macrocycle
SF-016Pavel Tsatsouline

A mesocycle is 2-8 microcycles (roughly one "block"); a single loading mesocycle should already show improvement, and complete adaptation takes at least 6 weeks.

pd-manual p.29 (pdf 35) §Mesocycle
SF-017Pavel Tsatsouline

A microcycle is 3-14 days long, with one week the most common length.

pd-manual p.40 (pdf 46) §Microcycle/week
SF-018Pavel Tsatsouline

Time-tested weekly template: 3 nonconsecutive days with the heavy day mid-week preceded by a light day 48h earlier for facilitation — e.g., Monday light, Wednesday heavy, Friday medium.

pd-manual p.41 (pdf 47) §Microcycle/week
SF-019Pavel Tsatsouline

The "60% rule": set light-day volume at 60% and medium-day volume at 80% of the heavy day's volume, maintaining intensity on the medium day and reducing it on the light day.

pd-manual p.41 (pdf 47) §Microcycle/week
SF-020Pavel Tsatsouline

A same-exercise light day typically lowers both reps per set and weight by 20-30% (e.g., 300x5/5 heavy → 225x4/5 light).

pd-manual p.41 (pdf 47) §Microcycle/week
SF-030Pavel Tsatsouline

Daily NL (number of lifts) per class of exercise counted at ≥70% 1RM: 10-20 is minimal, 20-30 optimal, 30-50 maximal for experienced strength athletes.

pd-manual p.5 (pdf 11) §Volume
SF-031Pavel Tsatsouline

If a single exercise's daily load exceeds NL 30 or takes longer than 30min, split it into multiple series separated by unrelated exercises or at least 30min of passive rest.

pd-manual p.22 (pdf 28) §Rest—Session Duration
SF-032Pavel Tsatsouline

Comparing 70, 80, and 90% 1RM, 90% builds strength fastest but the gains are unsustainable, while 80% develops more strength over the long term.

pd-manual p.6 (pdf 12) §Intensity
SF-033Pavel Tsatsouline

Monthly volume distribution across intensity zones: 50-60% of monthly NL at 70-80% 1RM, 30-40% at 81-90%, and 0-10% at 91-100%.

pd-manual p.45 (pdf 51) §Plan Strong Tactical
SF-034Pavel Tsatsouline

Zone definitions with reps per set: warm-up zone <70% 1RM at 4-10 reps, training zone 70-90% at 1/3-2/3 of the RM, control zone >90% at 1 rep.

pd-manual p.45 (pdf 51) §Plan Strong Tactical
SF-035Pavel Tsatsouline

Per-session NL options by intensity: 70% 1RM → NL 20/25/30; 75% → 15/20/25; 80% → 10/15/20; 85% → 5/7/10; 90% → 3/5.

pd-manual p.48 (pdf 54) §Plan Strong Algorithm 1118D
SF-036Pavel Tsatsouline

A >90% 1RM day carries no NL prescription: work up to a comfortably heavy single, attempt a PR only if exceptionally strong, and recalculate the 70-90% training weights after any PR.

pd-manual p.48 (pdf 54) §Plan Strong Algorithm 1118D
SF-037Pavel Tsatsouline

Work-set reps per intensity: 70% 1RM → 3-6 reps, 75% → 3-5, 80% → 2-4, 85% → 2-3, ≥90% → 1, varying within each range as much as possible.

pd-manual p.49 (pdf 55) §Plan Strong Algorithm 1118D
SF-038Pavel Tsatsouline

Warm-up set reps by load: 50-55% 1RM → 3-5 reps, 60-70% → 1-3, 75-80% → 1-2, 85-95% → 1.

pd-manual p.49 (pdf 55) §Plan Strong Algorithm 1118D
SF-039Pavel Tsatsouline

Between-set rest: with weights up to 90% 1RM rest until fully recovered plus one extra minute, never compressing rests; with >90% weights rest 5min or longer.

pd-manual p.49 (pdf 55) §Plan Strong Algorithm 1118D
SF-040Pavel Tsatsouline

The optimal repetition range for strength is 1-6 reps per set.

pd-manual p.12 (pdf 18) §Reps and Effort
SF-041Pavel Tsatsouline

Effort distribution: most strength-training volume sits at RPE 6-8, only 5-10% of total volume at RPE 8-9, and RPE 9-10 is reserved for 1RM tests and PR attempts no more than 2-3 times per year.

pd-manual p.14 (pdf 20) §Reps and Effort
SF-042Pavel Tsatsouline

E1RM formula from two rep maxes: E1RM = RM1 + (n1 − 1) × (RM1 − RM2) / (n2 − n1), where RM1 must come from the 3-5 rep range and RM2 from the 8-10 rep range (e.g., 5RM 85kg and 8RM 70kg give E1RM 105kg).

pd-manual p.8 (pdf 14) §Estimated 1RM (E1RM)
SF-043Pavel Tsatsouline

If a max-rep test is done at 80% 1RM (or anywhere in 77.5-82.5%), reps at any percentage P between 70 and 99 are estimated as RM(P%) = 1 + ((n − 1)/20) × (100 − P), with a maximum error of ±1 rep.

pd-manual p.9 (pdf 15) §Estimating RM at different % 1RM
SF-044Pavel Tsatsouline

If the test load falls outside 77.5-82.5% 1RM, use RM(P%) = RM(Pt%) + ((RM(Pt%) − 1)/(100 − Pt)) × (Pt − P), where Pt is the tested percentage; fractional results are always rounded down.

pd-manual p.11 (pdf 17) §Estimating RM at different % 1RM
SF-045Pavel Tsatsouline

The RM lookup table spans RM@80% columns 4-14 and rows 70-100% 1RM with the 80% row as identity; e.g., an athlete with 8RM at 80% gets 4 reps at 90%, 6 at 85%, 9 at 75%, and 11 at 70%.

pd-manual p.10 (pdf 16) §Estimating RM at different % 1RM
SF-060Pavel Tsatsouline

Linear cycling: build 4-6 week mesocycles in which each week's main session is harder than the prior week's, with weight and reps peaking in the final week.

pd-manual p.30 (pdf 36) §Linear cycling
SF-061Pavel Tsatsouline

One-variable rule (Morehouse): increase only one load variable (weight, reps/set, or sets) until it reaches a constant, then change another, progressing RPE from ~6-7 up to ~8.5-9.

pd-manual p.31 (pdf 37) §Linear cycling
SF-062Pavel Tsatsouline

When intensity is the progression variable, step it up in 2-5% 1RM increments (the Power to the People! template adds 2-3% 1RM per session).

pd-manual p.31 (pdf 37) §Linear cycling
SF-063Pavel Tsatsouline

Classic wave cycling: a 6-week mesocycle of two ascending waves — "two steps forward, one step back" — rather than a straight climb.

pd-manual p.33 (pdf 39) §Wave cycling
SF-064Pavel Tsatsouline

Step cycling: hold the load constant for 1-3 microcycles before raising it, with 1-week steps optimal for hypertrophy.

pd-manual p.35 (pdf 41) §Step cycling
SF-065Pavel Tsatsouline

Add load when it becomes habitual (Rodionov).

pd-manual p.35 (pdf 41) §Step cycling
SF-066Pavel Tsatsouline

In distributed loading, load the endocrine system ~2 weeks then unload ~2 weeks per month — unless RPE never exceeds 8, in which case weekly loading is fine ("the less you load, the less you have to unload").

pd-manual p.31 (pdf 37) §Linear cycling
SF-067Pavel Tsatsouline

"Stealth" deload: even while weight rises every week, cutting reps/sets drops RPE, so the first week of each 4-week block functions as a deload.

pd-manual p.39 (pdf 45) §Fitting progressive overload mesocycles together
SF-068Pavel Tsatsouline

Maintenance beats churn: frequent alternation of adaptation and deadaptation overstrains adaptive capacity, so maintain with moderate loads rather than rebuild repeatedly.

pd-manual p.39 (pdf 45) §Fitting progressive overload mesocycles together
SF-069Pavel Tsatsouline

After a developmental mesocycle, if not competing, build another by changing a couple of things while keeping the progression rhythm — keep raising the chosen variable once a week for 6 weeks.

pd-manual p.39 (pdf 45) §Fitting progressive overload mesocycles together
SF-070Pavel Tsatsouline

6-week adaptation window (Olbrecht/Neumann): weeks 1-2 are the fast-adaptation phase and weeks 3-6 the stabilization phase, so wait ~6 weeks before swapping in a new stimulus.

pd-manual p.29 (pdf 35) §Mesocycle
SF-071Pavel Tsatsouline

Training residual: maximal strength — both neural and hypertrophy adaptations — is maintained for 30±5 days, so a gap shorter than ~one month costs little and 2-4 week alternating blocks build one quality without losing the other.

pd-manual p.43 (pdf 49) §Hypertrophy training
SF-072Pavel Tsatsouline

The longer a stimulus is held, the deeper the adaptation and the longer it survives detraining; conversely, the faster an adaptation is formed the faster it is lost (p.27 / pdf 33).

pd-manual p.29 (pdf 35) §Mesocycle
SF-073Pavel Tsatsouline

After a competition or a maximal-intensity session the CNS needs at least 3 weeks to recover, and you should not exceed 90% 1RM for more than 3 weeks running.

pd-manual p.39 (pdf 45) §Fitting progressive overload mesocycles together
SF-074Pavel Tsatsouline

Re-entry rule: when resuming training after injury, illness, or a layoff, step cycling (very gradual progression) is the preferred structure — and a 1RM test is not advisable on a lift not practiced for some time; use %nRM instead (p.15 / pdf 21 §RPE/RIR vs. % 1RM).

pd-manual p.35 (pdf 41) §Step cycling
SF-075Pavel Tsatsouline

Sharp load increases are preferable to gradual — and the sharper the increase, the longer the stabilization phase that must follow it.

pd-manual p.36 (pdf 42) §Step cycling
SF-080Pavel Tsatsouline

Easy Strength Classic 2.0 uses 2-3 global and regional barbell strength exercises (power cleans and clean pulls acceptable) trained 2-3 sessions per week.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-081Pavel Tsatsouline

Intensity is 80-95% 1RM (roughly a 2-8RM weight) for 1-6 reps per set at a medium bar speed.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-082Pavel Tsatsouline

Effort cap: terminate each set before the bar starts slowing, keep RPE at 7-8, and finish the session feeling stronger than at the start.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-083Pavel Tsatsouline

Per-lift session volume is NL 10-20 for "easy strength" or 20-30 for better results, with ordinary rest periods of typically 3-5min.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-084Pavel Tsatsouline

Change the intensity every training session — cycled or varied informally/randomly — and if varying randomly, change the set-and-rep scheme every time.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-085Pavel Tsatsouline

In season, do not stop strength training but reduce volume by 1/2-2/3, optionally dropping from 3 to 2 strength sessions per week.

pd-manual p.44 (pdf 50) §Easy Strength Classic 2.0
SF-086Pavel Tsatsouline

The modified York Barbell weekly template trains a lift on 3 nonconsecutive days with the heavy day midweek (Monday light, Wednesday heavy, Friday medium), the light day's volume at 60% of the heavy day's and the medium day's at 80%, with intensity maintained on the medium day and reduced on the light day.

pd-manual p.41 (pdf 47) §Rest—Frequency
SF-087Pavel Tsatsouline

A safe frequency for developmental (heavy) loads targeting a given quality is once every 5-7 days.

pd-manual p.41 (pdf 47) §Rest—Frequency
SF-088Pavel Tsatsouline

Plan Strong Tactical's core rules: train almost daily, uncouple volume from intensity, apply sharp load variability driven by the Delta 20 principle, periodically use concentrated loading, and take PRs opportunistically.

pd-manual p.45 (pdf 51) §Plan Strong Tactical
SF-089Pavel Tsatsouline

Weekly training frequency per lift is die-rolled: the press trains 2-4 days per week (3 on most rolls), the deadlift 1-3 days, and the squat 1-3 days.

pd-manual p.46 (pdf 52) §Plan Strong Algorithm 1118D
SF-090Pavel Tsatsouline

Concurrent-training guards: schedule ≥90% 1RM sessions when fresh and avoid endurance training for 24 hours after higher-volume (NL ≥ 20) lifting sessions.

pd-manual p.46 (pdf 52) §Plan Strong Algorithm 1118D
SF-091Pavel Tsatsouline

Triple Tier 2.0 runs three sessions per week per lift — heavy 85% 1RM (a 4-7RM) taking 15% of weekly volume, medium 75% (8-11RM) taking 30%, light 65% (12-15RM) taking 55% — holding average relative intensity stable at 71%.

pd-manual p.65 (pdf 71) §Triple Tier 2.0
SF-092Pavel Tsatsouline

ROP-H schedules 4 weekly sessions (e.g., Mon/Tue/Thu/Fri), each training one movement-pattern group heavy and another light plus specialized-variety slots, and qualifies as a wave cycle because ARI rises each week within the 4-week step.

pd-manual p.76 (pdf 82) §Barbell Plan ROP-H
SF-093Pavel Tsatsouline

Heavy-day scheme is (2, 3, 5)/3 — per round 2 and 3 reps with the heavy weight and 5 with the medium weight, three rounds — with the heavy weight stepping from 1RM−(Y×5) up by Y per block (weeks 1-4, 5-8, 9-11, 12-14) to 1RM−(Y×2), the medium weight always Y×2 below it, a taper of (2,3)/3, (1,3)/2, then 1/3 over weeks 12-14, and a 1RM test in week 15.

pd-manual p.77 (pdf 83) §Barbell Plan ROP-H
SF-094Pavel Tsatsouline

Light-day scheme: 60% 1RM for 5/5 through weeks 1-12, then 60%+Y for 4/5 (week 13), 60%+2Y for 3/5 (week 14), and 60%+3Y for 2/5 (week 15).

pd-manual p.79 (pdf 85) §Barbell Plan ROP-H
SF-095Pavel Tsatsouline

Minimalist ROP-H versions use 2-3 lifts and no specialized variety: a 3-session/week schedule (each session one pattern heavy, one light) or a 2-session/week schedule pairing upper-body press/pull with squat/hip-hinge.

pd-manual p.80 (pdf 86) §Barbell Plan ROP-H
SF-096Pavel Tsatsouline

Short sessions are preferable because free-radical damage intensifies as a session progresses and peaks toward its end; pair this with the 30min/NL-30 split rule [SF-031].

pd-manual p.22 (pdf 28) §Rest—Session Duration