Interval Training & VO2max: How to Improve Your Running

Understand and integrate speed work into your training to run faster and longer

Interval training is the #1 tool to improve as a runner. By alternating fast running and recovery phases, you improve your VO2max, your ability to sustain a strong pace, and your running economy. Whether you're preparing for a 10K, half marathon or marathon, speed work makes the difference. RunRun helps you integrate the right sessions into your training plan.

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What is VO2max?

VO2max represents the maximum rate at which your body can use oxygen during exercise. It's your aerobic ceiling. All training paces derive from it.

Improve at every distance

A higher VO2max means faster everywhere: 5K, 10K, half, marathon. A VO2max pace of 15 km/h equates to roughly 4:15 marathon, 18 km/h to roughly 3:15.

30 to 50 minute sessions

Interval work is intense but short. 15 min warm-up, 15-25 min work block, 10 min cool-down. Effective even with limited time.

Built-in recovery

Recovery phases (jog or walk) between efforts are integral to the session. They allow you to maintain quality across repetitions.

1 to 2 sessions per week

Speed work is done 1 to 2 times per week max, always surrounded by easy runs. The rest of the week is easy-paced endurance.

Paces adapted to your VO2max

RunRun calculates your interval paces based on your VO2max or recent 10K time. Every session is personalized.

Essential interval sessions

30/30 — The classic VO2max session

30 seconds fast / 30 seconds recovery. The most classic speed session, ideal for starting interval training.

Warm-up: 15 min easy jog + drills
Block: 2×(10×30s at 100% VO2max / 30s jog) — 3 min recovery between sets
Cool-down: 10 min easy jog + stretching
Total duration: ~45 min

200m / 400m — Short intervals

Short, fast efforts to build power and stride efficiency.

Warm-up: 15 min easy jog + drills
Block: 10×200m at 105% VO2max (200m jog recovery) or 8×400m at 100% VO2max (75s recovery)
Cool-down: 10 min easy jog
Track recommended for measured distances

1000m repeats — The classic kilometer

Medium intervals to work 10K pace and lactate threshold.

Warm-up: 15 min easy jog + drills
Block: 5 to 6×1000m at 95% VO2max (90s jog recovery)
Cool-down: 10 min easy jog
Key session for 10K preparation

Pyramid — Complete workout

Distance variation to work all energy systems: 200-400-600-800-600-400-200.

Warm-up: 15 min easy jog
Block: 200m-400m-600m-800m-600m-400m-200m at 95-105% VO2max (recovery = half the effort time)
Cool-down: 10 min easy jog
Demanding session — intermediate level minimum

Tempo runs — Threshold work

5 to 10 min blocks at race pace (half or marathon) to learn to hold race rhythm.

Warm-up: 15 min easy jog
Block: 3×10 min at half marathon pace (2 min recovery) or 4×8 min at marathon pace (90s recovery)
Cool-down: 10 min easy jog
Ideal session 4-6 weeks before race day

Tips for effective interval training

Always warm up

15 minutes progressive jog minimum before any speed session. Add drills (high knees, butt kicks, bounding strides).

Respect the paces

Too fast = you won't finish the session. Too slow = not enough stimulus. Use a GPS watch or distance markers to stay in target zone.

Prioritize consistency

The goal is to run all reps at the same pace. If you slow down significantly on the last ones, you started too fast.

Don't do intervals when tired

Do speed sessions rested, never the day after a long run. Quality matters more than quantity.

Know your VO2max

Do a VO2max test (6-minute test, Vameval, or estimate from a recent 10K time). It's the foundation for calculating all your training paces.

Questions fréquentes

What exactly is VO2max?

VO2max is the maximum rate at which your body can consume oxygen during exercise. It's your aerobic ceiling. You can sustain it for about 6 minutes continuously. All training paces are calculated as a percentage of VO2max pace.

How many interval sessions per week?

1 to 2 maximum. Speed work is very demanding on the body. The rest of the week should be easy running. More than 2 intense sessions per week increases injury and overtraining risk.

I'm a beginner — can I do intervals?

Yes, but only after several months of regular running (at least 3 sessions/week for 2-3 months). Start with 30/30 at moderate intensity (90-95% VO2max) before moving to harder sessions.

How can I estimate my VO2max without a test?

Quick method: VO2max pace ≈ average 10K speed × 1.05. Example: 10K in 55 min = 10.9 km/h → VO2max pace ≈ 11.5 km/h. For more accuracy, do a 6-minute all-out test (distance × 10 = VO2max pace).

Do I need a track for interval training?

No, not necessarily. The track is handy for measured distances (200m, 400m, 1000m), but time-based intervals (30/30) work great on trails or roads. A GPS watch is all you need.

Add intervals to your training

RunRun calculates your interval paces and integrates the right sessions into your personalized training plan.

Create my plan with intervals