Chasing 2:25: a 10-week half marathon plan

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The beginning

Saturday came in cold, the kind of cold that makes every breath remind you you’re awake. I pulled on my shoes, took in the park’s winding paths, and let my mind drift toward the race eight weeks out. My watch ticked past a steady 9:30 min/mile. Solid, but a 2:25 half marathon needed something more. The vision of crossing that line, banner overhead, pounding heart, the quiet satisfaction of “I made it”, is what pulled my legs forward. The plan below is for that moment when a goal sits just beyond your reach.

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The goal

Target: 13.1 mi (21.1 km) in 2 hours 25 minutes.

That’s an average pace of 10:38 min/mile (or 6:35 min/km). To get there you need three things: stamina to hold that effort across the full distance, threshold strength to run a pace you could sustain for an hour, and the grit to trust your preparation when your legs ask you to slow down.

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Pre-requisites

Before starting, check at least one:

Current ability	What it means for you
Recent 10K time of 55 min or under	You have the speed base to turn into half-marathon stamina.
Recent half-marathon time of 2:45 or under	You have the distance endurance; you need to sharpen the pace.
Running 20 mi per week comfortably with at least one 6-mi easy run	A solid mileage foundation.

Fall short on all three? Spend a few weeks building base first (3 to 4 mile easy runs, 2 to 3 days a week) before starting.

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How the plan works

Workout	Purpose	Typical pace / effort
Easy run	Recovery, aerobic foundation	11:30–12:30 min/mi (easy conversation)
Tempo run	Raise lactate threshold, train “comfortably hard” effort	10:45–11:00 min/mi (about 85–90% max HR)
Interval	Boost VO₂ max and leg speed	9:30–9:45 min/mi on work, full recovery jog
Long run	Build endurance, train fat use	11:30–12:00 min/mi (slow, steady)
Cross-training / rest	Aid recovery, prevent injury	Light bike, swim, yoga, or complete rest

These paces are starting points. Adjust by effort, heart rate, or a watch that recalibrates with your fitness. The structure bends: if a session leaves you wrecked, swap it for an easy run or a day off.

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Weekly plan (10 weeks)

Week	Mon	Tue	Wed	Thu	Fri	Sat	Sun
1	Rest/CT	Easy 4 mi	Tempo 4 mi (2 mi @ 10:45)	Easy 3 mi	Rest	Long 7 mi	Easy 3 mi
2	Rest/CT	Easy 5 mi	Intervals 5×800 m @ 9:30 with 400 m jog	Easy 3 mi	Rest	Long 8 mi	Easy 3 mi
3	Rest/CT	Easy 5 mi	Tempo 5 mi (3 mi @ 10:45)	Easy 4 mi	Rest	Long 9 mi	Easy 4 mi
4	Rest/CT	Easy 5 mi	Intervals 6×800 m @ 9:30 with 400 m jog	Easy 4 mi	Rest	Long 10 mi	Easy 4 mi
5	Rest/CT	Easy 6 mi	Tempo 6 mi (4 mi @ 10:45)	Easy 4 mi	Rest	Long 11 mi	Easy 4 mi
6	Rest/CT	Easy 6 mi	Intervals 5×1 mi @ 9:30 with 400 m jog	Easy 5 mi	Rest	Long 12 mi	Easy 5 mi
7	Rest/CT	Easy 6 mi	Tempo 7 mi (5 mi @ 10:45)	Easy 5 mi	Rest	Long 13 mi	Easy 5 mi
8	Rest/CT	Easy 6 mi	Intervals 6×1 mi @ 9:30 with 400 m jog	Easy 5 mi	Rest	Long 14 mi	Easy 5 mi
9	Rest/CT	Easy 5 mi	Tempo 6 mi (4 mi @ 10:30)	Easy 4 mi	Rest	Long 10 mi (cut-back)	Easy 4 mi
10	Rest/CT	Easy 4 mi	Tempo 4 mi (2 mi @ 10:30)	Easy 3 mi	Rest	Race day, 13.1 mi	—

CT means cross-training (optional low-impact activity).

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Detailed workout descriptions

Easy run

Conversational pace. Relax your shoulders, maintain a quick turnover, breathe steadily throughout.

Tempo run

1. 1 mi of easy running to warm up.
2. Run the listed distance at 10:45 min/mi (or an effort that’s hard but manageable). You feel a burn, but short phrases are still possible.
3. 1 mi of easy running to cool down.

Interval session

1. 1 to 2 mi easy running.
2. Each repeat (800 m or 1 mi) at 9:30 min/mi. Real effort.
3. Jog or walk a 400 m recovery (about 2 to 3 min of lighter activity).
4. Complete the prescribed reps.
5. 1 to 2 mi easy running to cool down.

Long run

Relaxed, steady tempo (about 11:30 min/mi). Time on feet, not speed. Drink regularly, test race-day fuel if you plan to use it.

Cross-training / rest

Swimming, cycling, yoga, or a steady walk for blood flow and tissue recovery without running’s impact.

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Notes and tips

• Progression: the long run grows about 1 mi every 3 to 4 weeks. If a week feels overwhelming, stay at the previous week’s volume before advancing.
• Recovery: 7 to 9 hours of sleep, plenty of water, balanced food (carbs, protein, healthy fats).
• Pacing tools: how hard it feels, heart rate, or a GPS watch that recalibrates as you improve.
• Pitfalls: cutting easy days short, running intervals as sprints, treating the long run as optional. Steady work beats occasional heroics.
• Pain: sharp pain means a rest day and an honest look. General soreness? Easy run or cross-training.
• Taper: final week, drop mileage by 30 to 40% with one or two short tempo bursts to keep the legs sharp.

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FAQ

Q: I missed a hard workout. Should I do it later in the week? A: If another easy day is open, sure. Don’t stack two tough sessions back to back.

Q: My 10K pace is slower than the tempo calls for. Can I still run this plan? A: Yes. Adjust the tempo pace to “hard yet doable” (try 11:00 min/mi) and work it down as you get stronger.

Q: What if the weather gets hot? A: Add 5 to 10 seconds per mile across all paces, rely on effort, hydrate aggressively.

Q: I struggle with shin splints. What helps? A: Strengthen hips and glutes, run on softer surfaces when possible, keep easy run volume reasonable.

Q: Can I replace the long run with two shorter runs? A: Not ideal. The long run builds mental toughness that matters race day. If you must split it, 6 mi followed by 4 mi on the same day. Aim for one go.

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Closing and workout suggestion

Hunting down 2:25 turns into a story that sticks with you. Each stride, each pre-dawn alarm, each post-run stretch becomes part of it.

Try the week 1 tempo: 4 miles with 2 miles at 10:45 min/mi. A first taste of “hard but sustainable” effort.

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References

• OTP Endurance Sports Half Marathon | running Training Plan | TrainingPeaks (Blog)
• MyProCoach Intermediate Half Marathon + Free Email Access to Coach: 10 Weeks | running Training Plan | TrainingPeaks (Blog)
• 1/2 Marathon 12 Week Beginner | running Training Plan | TrainingPeaks (Blog)
• BCA | Half Marathon ~ 6 wks. - ELITE - (7.5-8hrs/wk) + Free Consultation | running Training Plan | TrainingPeaks (Blog)
• 1/2 Marathon 16 Week Beginner | running Training Plan | TrainingPeaks (Blog)
• Half Marathon Training Plan | running Training Plan | TrainingPeaks (Blog)
• LEVEL 1 HALF MARATHON | Training Plan | TrainingPeaks (Blog)
• Guto’s Fernandes Plan - Half Marathon - Beginner - 14 Week - E-mail access to coach ( 2-5 Hrs/wk) | running Training Plan | TrainingPeaks (Blog)