Mile Repeat Run: 4 x 1 Mile at 10K Race Pace

Session Overview

Mile repeats are one of the most effective run sessions for building speed endurance at 10K race pace. This 50-minute session includes 4 x 1-mile efforts with recovery jogs, developing the sustained-pace fitness that translates directly to faster triathlon run splits.

What You’ll Need

• GPS watch or measured route (track, parkrun course or mapped road loop)
• Running shoes suitable for faster-paced efforts
• Flat or gently rolling terrain — avoid steep hills for this session

Warm-Up (10 minutes)

Jog easy for 8 minutes at conversational pace. Include 4 x 20-second strides at gradually increasing speed, with 40 seconds easy jogging between each. Finish with 2 minutes easy jogging before the first repeat.

Main Set

Run 4 x 1 mile (1.6km) at your current 10K race pace. If you do not know your 10K pace, aim for an effort you could sustain for 40-50 minutes — hard but controlled, RPE 8.

• Repeat 1: 1 mile at 10K pace. Settle into rhythm — do not start too fast. 90 seconds recovery jog.
• Repeat 2: 1 mile at 10K pace. Match your Repeat 1 time within 5 seconds. 90 seconds recovery jog.
• Repeat 3: 1 mile at 10K pace. This is the hardest one mentally — hold form and pace. 90 seconds recovery jog.
• Repeat 4: 1 mile at 10K pace or slightly faster. Empty the tank if you have paced well through the first three.

Cool-Down (8 minutes)

Jog easy for 5 minutes, gradually reducing pace. Walk for 3 minutes with gentle hamstring and calf stretches. Hydrate immediately after finishing.

Coaching Notes

• Consistency is more important than speed — aim for all four repeats within 5 seconds of each other
• If you are new to mile repeats, start with 3 repeats and add the fourth after 2-3 weeks
• Keep the recovery jog genuinely easy (Zone 1) — walking is fine if needed to bring heart rate down
• Advanced option: increase to 5 x 1 mile or reduce recovery to 60 seconds once 4 repeats feel manageable