Block 3, Registered: Threshold Work Enters, and the Method Audits Itself

Start here: Block 3 is the third cycle of the road-half build. The year's first deliberately hard running enters, one weekly threshold session building from 12 to 18 quality minutes; the long run extends toward 50 minutes; the Dallas half sits nine weeks out. This post publishes the plan, together with a disclosure the method itself forced. The block's structure was signed on October 5, before it started. Its formal criteria file was not written until October 14, nine days in, after week one had already produced this casebook's first failed scored session. A pre-registration method that conceals that distinction is not a method; it is marketing. The distinction is therefore published, criterion by criterion, below.

The provenance problem, stated plainly

What was genuinely frozen on October 5, documented and signed before a single session ran: the block's shape (aerobic capacity plus threshold, four weeks, two hard days never adjacent), the threshold progression (3 × 4:00 → 3 × 5:00 → 3 × 6:00 at a comfortably hard effort), the long-run progression (40 → 45 → 50 → recovery), the maintenance ruck, and week one's exact numbers.

What was not: the explicit pass/fail list. Block 1 and Block 2 each had one frozen at signature. Block 3's was formalized today, which means it can claim no predictive authority over a week already run; where that matters, the criterion below says so. The process correction is now a standing rule: from Block 4 forward, the registration file and its public post are completed at signature, before week one. The method's entire value is that the misses stay visible. This is one of them.

What Block 3 is

ISSA's half-marathon progression moves from pure aerobic capacity into aerobic capacity plus acidosis-threshold work (ISSA, Running Technique and Programming 135), and at recreational volume threshold is the honest performance lever, so it receives the block's entire quality budget. Threshold means comfortably hard: 80–85% of maximum heart rate, an effort at which one can speak in phrases but not in sentences (Running 173). Twelve minutes of it per week to begin — not intervals to be survived, but a dose to be absorbed.

Everything else stays genuinely easy, and easy remains a scored standard, because two blocks of data identify the real hazard for a returning runner: not the hard day, but the easy day quietly becoming a medium one. The hazard compounds from here, since each week before race day arrives cooler than the last and the Texas summer's governor lifts on its own.

The week

• Monday — easy run and maintenance strength (30–35 easy minutes, then 2–3 short rounds and eccentric calf raises)
• Wednesday — the threshold session: ten easy minutes of warm-up, the quality repetitions at a pace selected before the session, two easy minutes between, and a cool-down. Every repetition is lap-timed; if the third costs more than a point over the first, the pace was too ambitious, and it is logged rather than chased
• Friday — maintenance strength and the ruck at 10 lb, turn-timer enforced
• Saturday — rest, without exception
• Sunday — the long run, outdoors, RPE ≤ 5 throughout, turn-timer at halfway, with the outbound leg pre-committed slow

The volumes

Wk	Easy (Mon)	Threshold (Wed)	Ruck (Fri)	Long run (Sun)
1	30	3 × 4:00	45	40
2	30	3 × 5:00	50	45
3	35	3 × 6:00	50	50
4 (recovery)	25	3 × 4:00, same pace	35	30

The threshold minutes, long-run rungs, and ruck durations constitute the October 5 signature; the easy-day figures and week 4's exact recovery numbers were formalized on October 14 under the standing one-third-cut precedent, the same disclosure as above.

The criteria, with their provenance

1. Adherence ≥ 80% (13+ of 16 sessions). Standing pattern, inherited.
2. Long run reaches 50 continuous minutes at RPE ≤ 5 by week 3. The signed progression, and already compromised: week one's long run failed on pacing, the first failed scored session of this casebook, and the documented correction slid the rungs by a week. It scores against the frozen number regardless, with the decision trail attached.
3. The threshold progression completes: all three build sessions, repetitions in the comfortably-hard band, the last costing roughly what the first did, and no flag attributable to quality work.
4. Easy-effort discipline: zero easy or long runs at RPE 6 or above. Already carrying a miss, since week one's long run scored an 8. Formalizing a criterion already failed looks odd, and that is the point; the alternative was to omit it quietly.
5. Adverse-event register: zero items reaching three appearances. Both knee items enter at two of three, each quiet for more than sixty days.
6. Strength maintained, not lost: three or more strict pull-ups and an opening push-up set of 18 at capped effort, demonstrated in week 3.

What week one already taught

The short version, ahead of the full report: the threshold debut went exactly to plan, a pre-selected pace held across three even repetitions at the prescribed effort, and four days later the easy long run failed at RPE 8, because 92°F felt like relief after a 100°F summer and the pace spent the margin. Hard running with a mechanism succeeded; easy running without one failed, in the same week, on the same legs. That finding triggered an equipment decision twice deferred — a watch with wrist pace alerts, the outdoor equivalent of a treadmill belt — and it is the reason criterion 4 exists in writing despite the miss it already carries.

The report scores all of it in November.

ISSA-certified Running Coach; strength and conditioning work draws on ISSA's Tactical Conditioning curriculum (studied, not examined). One documented case plus certifying doctrine, not medical advice. Long-inactive readers, and anyone with a health condition, should consult a physician first.