The 400m repeat is where speed is built.

One lap. Hard. Recover. Repeat.

It's simple, effective, and the foundation of nearly every competitive runner's training. Here's how to do it right.

What Are 400m Repeats?

The Basics

A 400m repeat workout consists of multiple 400-meter intervals (one lap of a standard track) run at a hard pace, with recovery between each rep.

Example: 10 x 400m at 5K pace with 90-second jog recovery

Why 400m Works

The 400m distance hits a sweet spot:

• Long enough to develop aerobic capacity and lactate tolerance
• Short enough to maintain high quality and speed
• Precise enough to track progress week over week

What 400m Repeats Develop

• VO2max: Repeated efforts at high intensity
• Speed: Running faster than race pace
• Lactate tolerance: Learning to buffer and clear lactate
• Running economy: Efficiency at fast paces
• Mental toughness: Handling repeated discomfort

Finding Your 400m Pace

Method 1: From 5K Race Time

Standard approach: Run 400m repeats at current 5K pace or 3-5 seconds faster.

Method 2: By Effort

400m repeat effort should feel:

• Hard but controlled
• Faster than tempo, slower than all-out
• Sustainable for all reps (with recovery)
• 7-8 on a 10-point scale

It should NOT feel like:

• Sprinting (that's too fast)
• Easy (that's too slow)
• Desperate by the end of each rep

Method 3: Time-Based

If you're new to track workouts, run by time:

• 90 seconds hard, 60 seconds easy
• Adjust based on feel
• Use pace from first few reps as your target

Workout Structure

Warmup (Essential)

Never skip the warmup for 400m repeats:

1. Easy jog: 10-15 minutes
2. Dynamic stretches: Leg swings, high knees, butt kicks
3. Strides: 4-6 x 100m accelerations at 80-90% effort
4. Rest: 2-3 minutes before starting

The Main Set

Starting pace: Conservative. First 2 reps should feel almost too easy.

Middle reps: Settle into rhythm. Consistent splits.

Final reps: Maintain pace or slight pickup if feeling strong.

Recovery Between Reps

Standard recovery: 200m jog (half lap) or 60-90 seconds

Recovery guidelines:

• Jog slowly (truly easy)
• Don't stand still
• Return to start before full recovery (keeps you working)
• Feel ready for next rep, but not fresh

Cooldown

• Easy jog: 10-15 minutes
• Light stretching: Focus on hip flexors, quads, calves
• Walk: 5 minutes if needed

Sample 400m Workouts

Beginner (New to Track)

Workout: 6 x 400m at 5K pace with 200m jog recovery

Total volume: 2,400m of quality (about 1.5 miles)

Focus: Learning the rhythm, finding your pace, staying consistent

Progression:

• Week 1: 6 x 400m
• Week 2: 7 x 400m
• Week 3: 8 x 400m
• Week 4: 6 x 400m (recovery)

Intermediate (Regular Runner)

Workout A: 10 x 400m at 5K pace with 90-sec jog recovery

Workout B: 8 x 400m at 3K pace with 2-min jog recovery

Workout C: 12 x 400m at 5K pace with 200m jog recovery

Total volume: 4,000-4,800m of quality (2.5-3 miles)

Focus: Building volume, improving consistency, testing speed

Advanced (Competitive Runner)

Workout A: 16 x 400m at 5K pace with 60-sec recovery

Workout B: 12 x 400m at 3K pace with 90-sec recovery

Workout C: 5 x (3 x 400m) with 60-sec between reps, 3-min between sets

Total volume: 4,800-6,400m of quality (3-4 miles)

Focus: High volume, tight recoveries, race simulation

Speed-Focused 400s

Workout: 6-8 x 400m at mile pace with 3-min recovery

Purpose: Develop raw speed and power

Feel: Significantly harder per rep, full recovery between

400m Repeat Variations

Cut-Down 400s

Structure: Each rep faster than the last

Example: 8 x 400m starting at 10K pace, finishing at 3K pace

Purpose: Teaches negative splitting, builds confidence

Broken Sets

Structure: Groups of 400s with longer rest between sets

Example: 3 x (4 x 400m) with 90-sec between reps, 4-min between sets

Purpose: Allows more volume at quality pace

400m Ladder

Structure: Progressive distances starting/ending with 400m

Example: 400-800-1200-800-400 (all at 5K pace)

Purpose: Variety, tests different energy systems

Mixed 400s

Structure: Alternate fast and float 400s

Example: 12 x 400m alternating 5K pace and 10K pace

Purpose: Active recovery, extended workout time

Common 400m Mistakes

1. Going Out Too Fast

The mistake: First 200m is 5 seconds faster than second 200m.

The problem: You're sprinting, not doing intervals. Quality suffers.

The fix: First 200m should feel controlled. Even or negative split each rep.

2. Inconsistent Splits

The mistake: Reps range from 1:40 to 2:00.

The problem: No physiological consistency. Hard to track progress.

The fix: Target the same split every rep. If you can't, slow down the pace.

3. Standing During Recovery

The mistake: Stopping completely between reps.

The problem: Heart rate drops too much. Harder to start next rep.

The fix: Keep moving. Jog slowly or walk briskly.

4. Too Much Volume

The mistake: Running 20 x 400m because more is better.

The problem: Quality drops. Injury risk increases. Recovery compromised.

The fix: When pace drops 5+ seconds, stop. Quality over quantity.

5. Skipping the Warmup

The mistake: Jogging one lap and starting the workout.

The problem: Cold muscles, poor initial rep quality, increased injury risk.

The fix: Full warmup: 10-15 min easy + dynamics + strides.

Programming 400m Repeats

Weekly Placement

Sample week:

• Monday: Easy run
• Tuesday: 400m repeats
• Wednesday: Easy run
• Thursday: Tempo run
• Friday: Rest or easy
• Saturday: Long run
• Sunday: Easy run

By Training Phase

Base phase: Limited 400s, focus on strides and easy running

Build phase: Weekly 400m sessions, progressive volume

Peak phase: Race-specific workouts, may reduce volume

Taper: Short, sharp 400s at reduced volume (6-8 reps)

Progression Over 8 Weeks

Recovery After 400m Workouts

Same Day

• Complete cooldown (don't skip)
• Hydrate and refuel within 30 minutes
• Light stretching or foam rolling

Following Day

• Easy run only (or rest)
• Keep pace truly easy
• Distance: Normal easy day or slightly shorter

Signs You're Recovering Well

• Next workout at full quality
• No lingering leg heaviness
• Sleep quality maintained
• Energy levels normal

Signs You Need More Recovery

• Can't hit paces in next speed session
• Legs feel dead on easy runs
• Elevated resting heart rate
• Unusual fatigue or irritability

The 400m repeat is track work at its purest. One lap, hard effort, brief recovery, repeat. Master this workout and you'll have the speed and fitness to race faster at every distance.

Find your target 400m pace with our Interval Workout Generator.