5x1000m Threshold Track Intervals: 10K Pace Session

Session Overview

Five reps of 1000m at 10K race pace, a classic threshold-building session for triathletes who want a run leg that holds up when the fatigue from the swim and bike is already banked. This is a track session, but a flat, quiet road loop works too if a track isn’t available.

What You’ll Need

• Access to a track (or a measured, flat 1km loop)
• GPS watch or stopwatch for pacing
• Water for between reps

Warm-Up (15 minutes)

10 minutes easy jogging, building gradually. Follow with dynamic drills — high knees, butt kicks, leg swings — and 4 x 100m strides at increasing effort, walking back to recover between each.

Main Set

5 x 1000m at your current 10K race pace, with 90 seconds of easy jog or walk recovery between each rep. The target is consistency — reps 1 and 5 should be within a few seconds of each other, not a fast start followed by a fade.

• Rep 1-5: 1000m at 10K race pace, 90 seconds recovery
• If pacing feels off after rep 3, hold your current pace rather than chasing the original target — a consistent slightly-slower session beats an inconsistent fast one

Cool-Down (10 minutes)

10 minutes easy jogging, followed by light static stretching for calves, hamstrings and hip flexors.

Coaching Notes

• If you don’t know your current 10K pace, use your most recent race result or a recent time trial rather than guessing — this session only works with an honest target
• Common mistake: treating the recovery jog as a full stop. Keep moving at an easy shuffle to help clear lactate between reps
• Scaling down: reduce to 3-4 reps, or extend recovery to 2 minutes for beginners and those newer to structured track work
• Scaling up: reduce recovery to 60 seconds, or add a 6th rep once five reps at target pace feels sustainable
• RPE guidance: reps should feel like a 7-8/10 effort — hard and controlled, not an all-out sprint