Marathon Monday Week 1: Olympic Trials + CIM - Seth James DeMoor

Aug 13, 2025

Intro

This is a quick summary of Marathon Monday Week 1: Olympic Trials + CIM from Seth James DeMoor. It’s a great watch — we’re breaking it down so you can try the workout today. Be sure to check out the full video for all the details.

Key Points

Seth is launching a 20‑week “Marathon Monday” series to train for the 2022 Rotterdam Marathon, with a focus on Olympic‑Trials qualification (window opens Jan 1 2022) and the California International Marathon (CIM).
He outlines his race calendar (Feb 27 Gasparilla, Apr 10 Rotterdam, Sep 18 Pikes Peak) and how he’ll build volume in 15‑mile weekly increments (15 → 30 → 45 mi weeks).
To add speed early in the block, he does diagonal strides: 6 × 120‑meter strides across a soccer field to recruit fast‑twitch fibers.
The plan mixes high‑volume long runs (20‑23 mi) with dedicated speed work and recovery (foam‑rolling, bands).

Workout Example

Day 1 – Speed Strides (Diagonals)

Warm‑up 10‑15 min easy jog.
Diagonals – 6 reps of 120 m strides, back‑and‑forth across a flat field.
- Focus on quick turnover, stay upright, and land softly.
- Rest 30‑45 seconds between reps.
Cool‑down 5‑10 min easy jog + light stretching.

Adjust the number of strides or distance to match your current fitness; you can log the workout in the Pacing app.

Closing Note

Give the diagonal strides a try today and start building that speed for the Olympic‑Trials window and your marathon goals. Feel free to customize the mileage and pace in the Pacing app—let’s get faster together! 🚀