10km Race Pace Run: Sustained Threshold Effort

Session Overview

This 60-minute run session builds your ability to hold 10km race pace for a sustained block, developing lactate threshold and run durability. It’s ideal for intermediate triathletes targeting an Olympic-distance or sprint finish, training the pace you’ll need to hold off the bike.

What You’ll Need

• GPS watch or running app for pace tracking
• Flat or gently rolling road or track
• Heart rate monitor (optional)
• Water or electrolyte drink for post-session recovery

Warm-Up (12 minutes)

Begin with 8 minutes of easy jogging at conversational pace (zone 1–2), then add 4 x 20-second strides at roughly 5km race pace with 40 seconds easy between each. The strides wake up your neuromuscular system and prepare your legs for the harder effort ahead.

Main Set

The centrepiece is a 35-minute continuous block at your 10km race pace. This is a genuine threshold effort — uncomfortable but sustainable — sitting at around 85–88% of maximum heart rate. Don’t go out too fast in the first 5 minutes; the pace should feel like a controlled burn that builds over the middle section.

• 5 minutes at 10km race pace minus 10 seconds per km (controlled build)
• 25 minutes at 10km race pace (sustained threshold effort)
• 5 minutes at 10km race pace plus 10 seconds per km (controlled wind-down)

Cool-Down (8 minutes)

Drop pace immediately to an easy jog for 6 minutes, then walk for 2 minutes. Finish with calf, quad, and hip flexor stretches held for 30–45 seconds each. The cool-down is essential after sustained threshold work — don’t skip it.

Coaching Notes

• Use your most recent 10km race time (or recent parkrun x2) to calibrate pace — don’t guess
• If you’re racing off the bike, aim for the upper third of your 10km range rather than full effort
• A strong, tall running posture matters more at threshold — avoid collapsing forward as you fatigue
• To scale back: break into 2 x 15-minute blocks with 2 minutes easy jog between; to progress: add a 5-minute push at 5km pace at the very end
• Target RPE 7–8 throughout the main block