Longest Run Before My PB Attempt At TCS London Marathon – Summary - The Running Channel

Aug 13, 2025

Intro

This is a quick summary of Longest Run Before My PB Attempt At TCS London Marathon from The Running Channel. It’s a great watch — we’re breaking it down so you can try the workout today. Be sure to watch the full video for all the details.

Key Points

The run is a confidence‑building marathon‑pace rehearsal: 5 km warm‑up, 25 km at marathon pace, then 5 km cool‑down (total ~35 km).
Pacing: Warm‑up ~5:30 min/km, marathon‑pace segment around 4:45‑5:05 min/km (average 4:59 min/km reported).
Mental strategy: break the long run into 5 km chunks (or half‑marathon mark) to stay focused.
Hydration tip: practice drinking water/electrolytes during the run; dehydration was a major issue near the end.
Use a lap‑screen to monitor average pace rather than getting distracted by live splits.

Workout Example

5 km warm‑up @ ~5:30 per km
25 km at marathon pace (≈4:45‑5:05 per km) – aim for an average around 4:59 per km
5 km cool‑down @ easy pace

*If you’re new to marathon‑pace work, start with a shorter version (e.g., 6 km warm‑up, 20 km MP, 4 km cool‑down) and build up.

Practical Tips

Chunk the distance: think in 5 km blocks or “until the half‑marathon mark” to keep the effort manageable.
Focus on average pace: set the lap screen to show the average for the marathon‑pace block and ignore moment‑to‑moment fluctuations.
Hydration plan: carry a soft‑glass bottle with water and electrolytes; sip regularly, especially after 20 km.
Mental cues: repeat a positive mantra (e.g., “Everything’s fine, I’ll finish”) and visualize the finish line.
Customize: adjust the distances and paces to match your own marathon goal using the Pacing app.

Closing Note

Give this marathon‑pace long run a try this week – tweak the distances or paces to fit your current fitness, and log it in the Pacing app so you can fine‑tune your pacing. You’ve got this – go crush that confidence boost and get ready for race day!