12-Week Ultramarathon Plan

Program intention

Increase or maintain absolute strength while building the aerobic capacity, durability, and specific endurance required to complete a 50k ultramarathon.

About this program

Original concurrent strength and 50k ultramarathon training program. Built on principles of concurrent training: heavy resistance training (2x/week) to improve running economy, two-to-three easy aerobic runs, one quality session, and progressive long runs. Strength prioritizes high-load compound movements, single-leg work, and posterior chain for durability. Running emphasizes aerobic base with controlled intensity. Designed to develop both maximal strength and 50k race readiness without excessive interference. This program is meant to be repeatable.

Suggested fitness level

intermediate

Intermediate runner with solid strength training background. Strength sessions use heavy loads (generally 75%+) for low-to-moderate reps to improve force production and running economy. Keep easy runs truly easy. Quality sessions are controlled. Long runs progress gradually. Prioritize sleep and fueling. If fatigued, protect the long run and reduce strength volume first. Deload weeks reduce both running volume and strength volume.