Warmup
- 1.5 miles easy
- Dynamic drills: leg swings, A-skips, high knees
- 4 x 100m strides, last one building into the first rep
- 90 seconds rest before starting
Main Set
5 x 1 mile at threshold effort, 60 seconds standing rest between reps.
Threshold here means comfortably hard — the pace you could hold for about an hour if you had to. Strong, rhythmic, not racing. You should finish each mile feeling like you could have run another 400m at that effort, no more.
The 60 seconds rest is short on purpose. You won’t fully recover, and that’s the point — this workout is closer to a broken tempo than to traditional intervals. Stand, breathe, get back on the line.
Lap splits across all five miles should look almost identical. If mile 5 is more than 10 seconds slower than mile 1, you started too fast.
Cooldown
- 1.5 miles easy
- 5 minutes stretching: calves, hamstrings, hip flexors
Coach’s Notes
Cruise intervals are the bread and butter of endurance training. They build the lactate threshold — the pace at which your body shifts from clearing lactate to accumulating it. Push that ceiling up and your easy paces get faster, your race paces get more sustainable, and you stop dying in the back half of long races.
The temptation on this workout is to drift into 10K effort by rep 3. Resist it. Threshold should feel boring at the start, locked in by the middle, and earned at the end. If you finish wrecked, you ran a tempo race, not a threshold workout.
Two miles in is where most runners slip. That’s the spot to tune in — check your shoulders, breathing cadence, and turnover. Reset the form, hold the effort.
Scaling
Newer runners: 3 x 1 mile, 90 seconds rest. Or 4 x 1200m at the same effort with 60 seconds rest if a full mile feels like too much continuous work.
Advanced runners: 6 x 1 mile, 45 seconds rest. Or hold the 5 x 1 mile structure but run the last rep as a cutdown — first 800 at threshold, last 800 at 10K effort.