6x400m Mile Predictor

Aug 13, 2025

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Key training concepts

Speed-endurance repeat: a classic coach’s tool is the 6 × 400 m session with 1-minute recovery jogs between each rep. The combined time across all six tells you what mile pace is realistic.
Progressive overload: start with generous recovery, then cut it back as the season progresses. Building endurance means more reps (up to 10 × 400 m) for a clearer read on mile ability.
Benchmark laps: sub-4-minute mile aspirations need specific benchmarks. A 200 m in about 26 s and a 400 m in roughly 50 s (maximum effort).
Mental toughness: picture yourself racing, work on composure when the pace gets hard, and use the repeat session to build mental resilience.
Injury prevention: build foot and ankle strength, watch for bunion symptoms, and don’t jump mileage by more than 10% week to week.

Warm-up: 10-minute easy jog, then dynamic stretches (high-knees, butt-kicks).
Main set: 6 × 400 m at goal mile pace (roughly 1 min 00 s per 400 m if you’re chasing a 4-min mile). 1 min easy jog between reps.
Cool-down: 5 to 10 minutes of easy jogging and static stretches.

Tip: once you’re stronger, drop recovery to 45 s or add more repeats, up to 10 × 400 m. The Pacing app can dial in lap target and interval timing.

Run a test lap. Head to a track and clock a solo 400 m. Anything over 55 s means there’s still ground to cover. Target 50 s or faster.
Monitor recovery. Wear a heart-rate monitor and check resting pulse the morning after hard efforts. If it’s still high, slot in an easy run before your next push workout.
Weekly volume control. Don’t jump total miles or speed-work volume by more than 10% in a single week.
Strength: twice a week, foot-strengthening work like single-leg balance and towel scrunches to head off bunion trouble.

Try the 6 × 400 m workout this week. Dial paces to your fitness and log results in the Pacing app for ongoing tweaks.