High-Altitude Mile Repeats: Supercharge Half Marathon Training with a KEY Pivot for Race Day - Seth James DeMoor

Aug 13, 2025

Intro

This is a quick summary of High-Altitude Mile Repeats: Supercharge Half Marathon Training with a KEY Pivot for Race Day 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

Altitude + race‑pace focus: Run true race‑pace (5:00 min/mile) at 5,280 ft to train your neuromuscular system and fast‑twitch fibers for sea‑level speed.
The “pivot” mindset: When strong winds make a track session unsafe, move to a trail or another venue that gives a tailwind or neutral conditions.
Use the environment: A southwest tailwind on the Platte River Trail helped the author hit sub‑5‑minute miles despite the altitude.
Flexibility for coaches/athletes: Be ready to adjust location, direction, or rest intervals to keep the quality of the workout intact.

Workout Example

6 × 1‑mile repeats on a flat trail with 2 min jog recovery between each mile.

Target pace: 5:00 min/mile (race pace for a half‑marathon at sea level).
Actual splits achieved (at altitude, with tailwind): 4:58, 4:59, 5:02, 5:01, 4:58, 5:05.
Keep the effort aerobic but focus on crisp, quick leg turnover; you should feel the neuromuscular “snap” rather than pure cardiovascular fatigue.

Practical Tips to Apply Now

Scout alternate routes before a session; know where you can get a tailwind or at least avoid headwinds.
If you must pivot, maintain the same work‑to‑rest ratio (e.g., 2‑min jog) to preserve intensity.
Use a GPS watch or the Pacing app to set your target mile time; adjust for altitude by aiming slightly faster than sea‑level race pace if you have a tailwind.
After each repeat, focus on quick, light strides during the jog to reinforce fast‑twitch recruitment.

Closing Note

Give this high‑altitude mile repeat a try—modify the distances or rest to fit your current fitness, and use the Pacing app to lock in your target paces. Stay adaptable, keep training smart, and watch your half‑marathon speed soar! 🚀