Browse the full Decision Matrix

Lagging indicators. Confirm what already happened. Forensic. Use as monthly or quarterly confirmation that inputs are producing adaptation — not as the session-level signal.

• Load (weight on the bar)— The weight lifted on a given exercise.

  Why it misleads: Can go up while form degrades. Load without RIR or form context is ambiguous - you cannot distinguish adaptation from compensated failure.

• Body weight / scale weight— Scale reading.

  Why it misleads: Moves with hydration (±1-3 kg/day), sodium, glycogen, cycle, and bowel contents before it moves with body composition. Weekly weight is the minimum interpretable cadence.

• Session attendance— Did the client show up.

  Why it misleads: A client can attend 23 of 24 sessions, miss 30% of the prescription, work at 5 RIR instead of the prescribed 2 RIR, and never complete a full set at tempo. Attendance is not adherence.

• Estimated 1RM— Projected from sub-max performance (Epley, Brzycki, Wathan).

  Why it misleads: Error bands of 5-15%, widening with rep count. A "2.5 kg improvement" from a 5-rep estimate is often inside the noise band.

Leading indicators. Predict what is about to happen. Diagnostic. Track the top 2-3 inputs matched to each client via the Decision Matrix below.

1. 1.
   Adherence RateADH· Weekly

   Adherence is the precondition for every other input. A program that is not executed does not produce adaptation. Middelbeek et al. (2023) identify adherence as the strongest single predictor of long-term outcome.

2. 2.
   Set-Rep Completion at Target RIRSRC· Per Session

   The prescription is the dose. Under-completion compounds across 4-8 weeks into 15-20% under-dosing, which is often the entire cause of a "plateau" the trainer diagnoses as a programming failure. Zourdos et al. (2016) validated RIR as a measurable, trainable metric at r=0.88-0.91 in trained lifters.

3. 3.
   Volume-Load Per Muscle Group Per WeekVL· Weekly

   Krieger (2010, 2017) and Schoenfeld et al. (2017) established volume-load as the primary hypertrophy dose-response variable. The ACSM 2026 Position Stand reinforces the threshold: 10 or more working sets per muscle group per week for hypertrophy. Volume-load trend across a mesocycle tells you whether total stimulus is accumulating.

4. 4.
   RIR DriftRIR-D· Weekly

   Helms et al. (2018) and Zourdos et al. (2016) established that accumulated fatigue progressively narrows RIR at a given load. Without drift, the block has not accumulated - even if the weight on the bar did not change. A no-drift block is a maintenance block wearing the wrong label.

5. 5.
   Planned vs. Actual RPEP/A-RPE· Per Session

   Foster et al. (2001) validated session-RPE as an internal training-load metric that integrates intensity, volume, and subjective fatigue. A session planned as RPE 7 and reported as RPE 9 indicates accumulated fatigue, poor recovery, or prescription overshoot. A session planned as RPE 8 and reported as RPE 5 indicates under-dosing or movement-quality issues.

6. 6.
   Recovery MarkersREC· Pre Session

   Recovery is the substrate every training input operates on. A session prescribed at RPE 8 landing at RPE 10 on 3 hours of sleep is not the session you programmed. Plews et al. (2013) and related HRV-guided training research demonstrate that individualized recovery tracking improves dose calibration. PT Distinction 2026 research identified sleep quality and training-load completion as the two strongest adherence predictors alongside recovery readiness.

7. 7.
   Form Consistency Under LoadFORM· Per Mesocycle

   Form degradation is the most commonly unmeasured variable in progressive overload failures. Load can go up while form silently deteriorates, which means the stimulus the trainer thinks is being delivered is not the stimulus the body is receiving. Tracking form degradation is also the safest way to manage load progression.