Negative Split Track Session: 2×2km Race Pacing Drill

Session Overview

This negative split track session uses two 2km runs to teach controlled pacing discipline — running the second kilometre faster than the first. It’s a key race skill for triathlon, where starting too fast leads to blowing up in the final 3km of the run leg.

What You’ll Need

• 400m running track (or a measured 2km loop)
• GPS watch or track timing
• Race shoes or lightweight tempo trainers

Warm-Up (12 minutes)

Jog 1.5km at an easy conversational pace, then run 4×100m strides at 85–90% effort with a 60-second walk recovery between each. Finish with 2 minutes of walking before the first interval.

Main Set

Run two 2km intervals with a 4-minute walking recovery between them. Each 2km must be a genuine negative split — your second kilometre must be faster than your first. Start at 10km race pace for km 1, then push to 5km race pace for km 2.

• Rep 1: 2km — km 1 at 10km race pace, km 2 at 5km race pace
• 4 minutes walking recovery
• Rep 2: 2km — same structure, aim to match or beat Rep 1 times
• Each km 2 should be 8–12 seconds per km faster than km 1

Cool-Down (10 minutes)

Jog 1.5km very easy, then walk for 3 minutes. Follow with calf raises, hamstring stretches, and hip flexor lunges held for 30 seconds each.

Coaching Notes

• The most common mistake is starting km 1 too fast — resist the temptation to bank time early
• Easier: reduce to 2×1.5km or extend recovery to 6 minutes
• Harder: add a third rep, or reduce recovery to 3 minutes
• Target RPE: 6–7 for km 1, 8–9 for km 2
• Most effective 6–8 weeks before your target Olympic or sprint triathlon