Track Session: 6x800m at 5km Race Pace

Session Overview

This classic track session — six repetitions of 800m at your 5km race pace — builds the speed endurance and lactate tolerance that translate directly to a stronger run off the bike in triathlon. The workout sits at the boundary between threshold and VO2max training, making it one of the most effective run sessions for intermediate athletes targeting sub-45-minute 10km or sub-22-minute 5km run splits.

What You’ll Need

  • 400m running track (or measured road loop)
  • GPS watch with pace function
  • Training shoes rather than race shoes for this session

Warm-Up (15 minutes)

Jog 10-12 minutes easy at Zone 1-2. Follow with dynamic mobility: leg swings, hip circles, high knees and heel flicks. Finish with 4 x 100m strides at 90% effort, 60 seconds walking recovery between each. You should feel loose and ready to run fast before the first 800m rep.

Main Set

Run 6 x 800m at your current 5km race pace. Take 90 seconds full recovery (walk or very easy jog) between each repetition. The pace should feel hard but controlled — you should be able to complete all six at roughly the same speed.

  • Reps 1-2: Settle into pace — resist going out too fast
  • Reps 3-4: The key reps — hold the pace when it begins to feel difficult
  • Rep 5: Mental strength rep — stay relaxed, drive the arms
  • Rep 6: Final effort — match or improve on rep 1 time if possible

Cool-Down (10 minutes)

Jog 10 minutes easy at Zone 1. Spend five minutes stretching quadriceps, hamstrings, calves and hip flexors. Do not rush the cool-down — this is when recovery begins and the session becomes embedded.

Coaching Notes

  • 5km race pace example: if your 5km PB is 22:00 (4:24/km), target 3:32 per 800m rep
  • If new to track intervals, start with 4 x 800m and build to 6 over several weeks
  • RPE target: 8/10 for the last two reps — hard but not maximal
  • The 90-second recovery is deliberately short — incomplete recovery is part of the training stimulus
  • Do not schedule this session two days before a long ride or brick workout

Training at your own risk. The information provided is for general guidance only and is not a substitute for professional medical advice. Please consult a doctor before starting any new exercise programme, especially if you have any pre-existing health conditions.