400 Meter Repeats: The Classic Speed Workout

400 meter repeats are a classic speed workout because they are long enough to challenge aerobic power and short enough to practice fast, efficient rhythm. Start with 6 to 8 repeats at roughly 5K pace, recover with 200 meters jogging or 60 to 90 seconds easy, and aim for even splits. The workout should feel sharp, not reckless.

Why 400s work

A single 400 is manageable. Repeating it with limited recovery creates the training effect. You accumulate time near high oxygen demand, practice running fast while relaxed, and learn how small pacing errors feel. For newer runners, 400s also make the track less intimidating because each repeat has a clear start and finish.

Common 400m workouts

• Beginner: 6 x 400m at 5K effort with 200m walk-jog recovery.
• 5K runner: 10 x 400m at goal 5K pace with 200m jog recovery.
• Mile focus: 8 x 400m near mile pace with 2 to 3 minutes recovery.
• 10K support: 12 x 400m slightly faster than 10K pace with short jogs.
• Maintenance: 6 x 400m relaxed-fast after a lighter training week.

How to run the session

1. Warm up with 10 to 15 minutes easy plus drills or strides.
2. Run the first repeat controlled so you can match it later.
3. Use the same recovery every time unless the workout says otherwise.
4. Stop if your form falls apart or your splits slow by more than 5 percent.
5. Cool down for 10 minutes and keep the next day easy.

Choosing the right pace

For most distance runners, 400s belong around current 5K pace to slightly faster, not sprint pace. If your 5K pace is 8:00 per mile, a 400 around 1:58 to 2:00 is a sensible starting point. If you are training for the mile, you may run faster with longer recovery. Match the pace to the purpose, not your ego. When unsure, choose the slower target and finish composed.