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JUIntervals for a sub-20 min 5k ↓
If you’re chasing sub-20, here are 3 interval structures that work:
- 400m intervals: 8-12 reps, 60-90 sec rest
- 800m intervals: 5-8 reps, 90-120 sec rest
- 1k intervals: 3-5 reps, 120-180 sec rest
Aim for 5-8k (3-5mi) total volume with 1k (0.6mi) warm-up and cool-down at easy pace.
Here’s what most people get wrong though: they see “intervals for sub-20” and try to force themselves to hit 3:35-3:45/km (5:45-6:02/mi) for 400s when they’re not ready yet.
Result?
They get wrecked, can’t recover, and either burn out or get injured.
Adjust the paces to YOUR current fitness.
If you’re at 22-23 min right now, run your 400s at 3:50-4:00/km (6:10-6:26/mi). Still hard, still effective, but manageable.
The goal is challenging but controlled… not destroying yourself trying to hit someone else’s numbers.
If you can hit 3:35-3:45/km for 400s, 3:45-3:55/km for 800s, and 3:50-4:00/km for 1ks, you’re very close to sub-20.
And, here’s what most people miss: for many runners, speed isn’t the limiter, endurance is.
You might run a 3:30/km (5:38/mi) 1k, but can you hold 4:00/km (6:26/mi) for 5k straight?
If not, you don’t need more intervals.
You need more mileage and aerobic base work.
Check your balance: 5k pace should be ~20-25 sec/km (30-40 sec/mi) slower than 1k pace.
If it drops more, build your aerobic engine first.
Intervals work when they’re part of a complete plan: speed work + long runs + easy runs + strength training + recovery.
You can’t spam intervals and expect progress… you’ll just break down.
Comment “faster” for my free running guide, or check the link in bio for 1:1 coaching.
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