Warmup
- 1.5 miles easy
- Dynamic drills: leg swings, A-skips, high knees
- 4 x 100m strides, the last one rolling into the start of the tempo
- 1 minute rest, then go
Main Set
4 continuous miles at threshold effort, with a 30-second surge at 5K effort every 4 minutes.
Threshold is the rhythm — comfortably hard, the pace you could hold for about an hour. Every 4 minutes the watch beeps, you bump the gear up to 5K effort for 30 seconds, then drop back to threshold and hold.
You’ll get four surges total across the run. The trap on every one is the same: after the surge, your legs want to bail out below threshold to “recover.” Don’t. The whole workout is teaching you to settle straight back into hard work after a hard moment. Threshold means threshold, before and after.
Run it as one continuous block. No standing, no walking, no water breaks between segments. Drop a bottle at the start/finish line if you need it.
Cooldown
- 1 mile easy
- Stretch: calves, hamstrings, hip flexors
Coach’s Notes
This is two workouts braided together. The 4-mile tempo trains the lactate clearance system that lives at threshold; the surges train the gear-change that races demand. Doing them at the same time is harder than either alone — the surges make the tempo feel heavier, and the tempo makes the surges harder to recover from.
Most road races are run this way. You hold a pace for ten minutes, someone in front of you opens a gap and you go with them, then you have to figure out how to keep racing once your heart rate has spiked. This workout rehearses exactly that.
The first surge is fine. The fourth surge is the one. If you can hit the same pace on surge four as surge one and finish the last mile clean, you’ve earned it.
Scaling
Newer runners: 3 miles continuous, surge every 5 minutes. Two surges total. Same efforts.
Advanced runners: 5 miles continuous, surge every 4 minutes. Or hold the 4-mile structure but extend the surges to 45 seconds at 5K effort. Another option: alternate the surge effort — the second and fourth at 3K effort, harder and shorter (20 seconds).