Build Phase 2 / Week 1 / Run 5 – Road to TOWaterfront 42K
I felt every single year of my 66 years. But I digress.

Pre-run, T-minus 1hr 30min-ish, I ate 2 slices of white bread and 2 tablespoons of jam and sipped Nuun. I considered taking 2 tablespoons of Brain Octane MCT, but ultimately decided against it. I carried 3 SiS gels, planning to consume one every 4 km. No gut distress-good sign. Still, Maurten remains my preferred brand despite the hit to the wallet.
During the run, I drank 500ml of Nuun and took SaltStick Fastchews about every 30 minutes. I stuck to my planned fueling timeline, so any pace degradation felt mechanical-likely leg strength.
The air quality warning might’ve played a role, but the temps were mild. I started too hot, flirting with the fast end of my Zone 2 range, and-true to form-I paid for it. The final 30 minutes dragged, though the last SiS gel may have unbottled some late energy.
Despite falling short of the prescribed average pace, I’m not concerned. I believe the adaptations will come. I also walked up inclines and during ingests to manage my heart rate.
Metrics Snapshot
Metric | Value |
Duration | 1:50:05 |
Distance | 15.1 km |
Avg Pace | 7:18/km |
Normalized Graded Pace (NGP) | 6:52/km |
Elevation Gain | 425 m |
Elevation Loss | 440 m |
Avg HR | 141 bpm |
Max HR | 154 bpm |
Pa:HR | 9.87% |
EF | 1.03 |
Cadence Avg | 161 spm |
rTSS | 142 |
hrTSS | 99 |
VAM | 232 m/h |
VAM W/kg | 1.16 |
What Your Numbers Say
rTSS vs hrTSS: A classic split-high rTSS (142) vs hrTSS (99) points to mechanical load taking the lead late in the run, consistent with your perception of leg fatigue.
Pa:HR at 9.87% shows moderate cardiac drift, which is fair given the length, elevation, and mid-run effort spikes.
EF of 1.03 holds up for an aerobic effort on hilly terrain. You’re becoming efficient, even when it hurts.
VAM & VAM W/kg show steady climbing capacity-great signs for aerobic strength on rolling terrain.
Takeaways
- Fueling strategy held strong with no gut distress.
- Early pacing felt smooth but likely too ambitious.
- Late-run fatigue suggests leg strength still developing for this distance.
- Walk breaks on hills were a smart trade-off to keep HR in Z2.
Still standing. Still stacking.
Yesterday’s mildly mild Z2 effort is worth a look too
Recap, Recover, Relax & Ready.
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