George, this is an excellent opening to Week 3, and the comparison with last Monday is particularly interesting.
The headline is:

You did the same 65-minute job as Week 2, slightly faster, but at a substantially lower cardiovascular cost.
That is exactly the kind of data we're looking for in Week 3 – Quiet Efficiency.
🟢 TQEP – Phase 2
Week 3 – “Quiet Strength”
Monday 10 August – Steady Row
Metric Week 2 Week 3 Change
Duration 65 min 65 min —
Pace 3:03.9 3:03.0 0.9 sec faster
SPM 18 18 —
Avg HR 112 109 −3 bpm
Max HR 121 118 −3 bpm
RPE 4 3–4 Slightly easier
Fatigue None None ✅
That is a very clean result.
🟢 METABOLIC: What is the engine doing?
This is the strongest signal from today's session.
Last week you rowed:
65 min @ 3:03.9 / 112 bpm

Today:

65 min @ 3:03.0 / 109 bpm

So you've increased the external workload slightly while reducing the internal cardiovascular cost.

That's exactly what we mean by improving aerobic efficiency.

It's only one session, so we shouldn't declare a physiological breakthrough—but this is a very encouraging data point.

The three numbers I particularly like:
+ faster pace
− lower HR

same duration

That relationship is far more informative than any one number by itself.

🔵 NEUROLOGICAL: What is the body doing?
This is equally interesting.
You maintained:

18 SPM
throughout the session while moving at 3:03.0.
And your splits are essentially perfect:

Segment Pace
0–13 3:03.0
13–26 3:03.0
26–39 3:03.0
39–52 3:03.0
52–65 3:03.0
That's not merely good pacing.
It's motor consistency.

Your nervous system appears increasingly comfortable reproducing the same movement pattern without needing constant correction.

That's the neurological side of the Quiet Engine.

🟣 The Two Systems Together
Here's the really useful picture:
Week 2

65 min
→ 3:03.9
→ 112 bpm
→ 18 spm

Week 3

65 min
→ 3:03.0
→ 109 bpm
→ 18 spm

The neurological component stayed almost identical.

The metabolic cost decreased.

That suggests today's improvement is primarily:

🟢 METABOLIC
rather than simply a change in technique or stroke rate.
And that's exactly what we wanted from Week 3.

Your “Strength – Recover – Repeat” Cue
You wrote:
“Build strength – Recover – repeat.”
I particularly like this because it describes the whole TQEP philosophy.
We're not trying to extract the maximum possible performance from Monday.

We're creating a stimulus that your body can:

absorb → recover from → repeat → build upon.

And your post-session feedback confirms that:

No lingering fatigue
HR stable
RPE only 3–4
The system is tolerating the workload.
One Thing I Want You to Notice
Compare your heart-rate profile:
Week 2:
112 → 114 → 116 → 117 → 120

Week 3:
Your average was only 109, maximum 118.

That's particularly encouraging because you're now beginning Week 3 rather than Week 2.

We're not seeing a progressive accumulation of fatigue.

We're seeing the opposite: the same workload appears to be becoming cheaper.

That's what adaptation looks like.

🟢 Session Assessment
Metabolic efficiency: ⭐⭐⭐⭐⭐
Neurological consistency: ⭐⭐⭐⭐⭐
Pacing discipline: ⭐⭐⭐⭐⭐
Recovery status: ⭐⭐⭐⭐⭐
Execution: 10/10
Primary identifier:
🟢 METABOLIC
Supporting identifier:
🔵 NEUROLOGICAL
Oscar's Takeaway
George, this is exactly why I wanted to introduce the two-layer analysis.
If we looked only at today's 3:03.0 pace, we'd say:

"Good steady row."

If we look at the relationship between the variables, we can say something much more interesting:

You're producing slightly more work, with the same movement frequency, while your cardiovascular system is working less hard.
That's a much richer story.
And there's another subtle development here.

Your phrase “Build strength – Recover – repeat” is beginning to describe not just the strength session, but the entire training philosophy.

Stimulus → absorption → adaptation → repeat.

That's how we're going to build this engine without ever needing to beat it into submission.

A very encouraging start to Week 3.

Onward.