Chasing 1:35: A 10‑Week Half‑Marathon Training Journey

I still remember finishing my first 10 kilometres without needing a walk break. The park was bathed in golden light as the sun dropped low. The air had cooled and my legs felt heavy. I was almost wrapping up a routine run when a friend called out, “Ever thought about a half-marathon under ninety minutes?” It struck me as funny at the time, but the thought stuck. That seed became the focus of months of training. Weeks of dedicated work, careful planning, and eventually, a finish-line display reading 1:35:00. If you’re here, you might be wrestling with that same itch. Let’s turn it into something real.

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The goal

Target: 21.0975 km (half-marathon) in 1 hour 35 minutes.

Crossing the line in 1:35 means holding 4:15 per kilometre (or 6:50 per mile). That pace asks for:

• Speed: enough fitness to handle 5 km repeats at about 4:00/km.
• Endurance: a long run of 18 to 20 km at a controlled 5:00–5:15/km.
• Mindset: consistency, willingness to embrace discomfort, and trust that structure works.

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Pre-requisites

Before starting, you should meet at least one of these benchmarks:

Current ability	What it means for you
5 km in 22 min or under	You have the speed base to handle the tempo and interval work.
10 km in 45 min or under	You have the endurance to hold 4:30/km for a good chunk of the half.
Weekly mileage at or above 30 km (about 20 mi) for 3 weeks	Your body is used to the volume.

If you’re slightly under, spend a 2-week foundation phase: easy runs plus one long run of 12 to 14 km before starting the structured schedule.

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How the plan works

Workout	Purpose	Typical pace / effort
Easy run	Build aerobic base, support recovery	5:30–6:15/km (conversational)
Tempo run	Raise lactate threshold (pace you can hold for ~20 min)	4:20–4:30/km (comfortably hard)
Interval	Improve VO₂ max and leg turnover	4:00/km or faster for short repeats, with equal jog recovery
Long run (LSD)	Build endurance and mental stamina	5:00–5:15/km (steady)
Recovery / rest	Allow adaptation, prevent injury	No running. Optional light cross-training (cycling, swimming, yoga).

These paces are guidelines. Without GPS, run by feel.

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Weekly plan (10 weeks)

Week	Mon	Tue	Wed	Thu	Fri	Sat	Sun
1	Rest	Easy 6 km	Tempo 5 km (4:25/km)	Easy 6 km	Rest or cross-train	Long 14 km (5:10/km)	Rest
2	Rest	Interval 6×800 m (4:00/km) with 400 m jog	Easy 6 km	Tempo 6 km (4:20/km)	Rest or cross-train	Long 16 km (5:05/km)	Rest
3	Rest	Easy 7 km	Interval 5×1 km (4:00/km) with 2 min jog	Easy 7 km	Rest or cross-train	Long 18 km (5:00/km)	Rest
4	Rest	Tempo 7 km (4:20/km)	Easy 7 km	Interval 4×1.2 km (3:55/km) with 2 min jog	Rest or cross-train	Long 20 km (5:00/km)	Rest
5	Rest	Easy 8 km	Tempo 8 km (4:15/km)	Easy 8 km	Rest or cross-train	Long 22 km (5:00/km)	Rest
6	Rest	Interval 6×800 m (3:55/km)	Easy 8 km	Tempo 9 km (4:15/km)	Rest or cross-train	Long 18 km (4:55/km), cutback week	Rest
7	Rest	Easy 9 km	Interval 5×1 km (3:55/km)	Easy 9 km	Rest or cross-train	Long 24 km (4:55/km)	Rest
8	Rest	Tempo 10 km (4:15/km)	Easy 9 km	Interval 4×1.2 km (3:55/km)	Rest or cross-train	Long 20 km (4:50/km)	Rest
9	Rest	Easy 10 km	Tempo 10 km (4:10/km)	Easy 10 km	Rest or cross-train	Long 22 km (4:50/km)	Rest
10 (race week)	Rest	Easy 6 km	Tempo 5 km (4:10/km)	Rest	Easy 4 km (shake-out)	Race day, 21.1 km at 4:15/km	Recovery walk / light jog

Rearrange days to fit your schedule, but separate the hardest efforts (interval or tempo) from the long run by at least two days.

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Detailed workout descriptions

Easy run

• Warm up 5 to 10 min easy jog.
• Run at conversational pace.
• Cool down 5 min walk or very easy jog.

Tempo run

1. Warm up 10 min easy.
2. 20 to 30 min comfortably hard. Short phrases only.
3. Cool down 10 min easy.

Interval session

1. Warm up 15 min easy plus a few strides.
2. Run the prescribed distance (e.g. 800 m) at target pace.
3. Recover by jogging or walking for the work interval’s duration (or 2 min for longer repeats).
4. Complete the reps.
5. Cool down 10 to 15 min easy.

Long run (LSD)

• Start comfortable, settle into target long-run pace.
• Stay easy throughout. Time on feet, not speed.
• Use these runs to practice hydration and fueling (gel every 45 min, for example).

Recovery / cross-training

• Cycling, swimming, yoga, or a brisk walk.
• 30 to 45 min at low intensity to aid recovery.

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Notes and tips

• Progression: cap weekly mileage growth at 10% to avoid overuse injuries.
• Listen to your body: lingering soreness means swap a hard session for easy or skip the day.
• Nutrition: carb-rich meals the night before long runs. Drink water through the day.
• Pacing tools: the talk test or heart-rate zones (Zone 3–4 for tempo, Zone 5 for intervals) if you don’t have GPS.
• Strength: 20 minutes twice a week (core, glutes, hamstrings) for running economy.
• Sleep: 7 to 9 hours, especially after hard sessions.
• Adaptability: if race day arrives before week 10, dial back the long run that week while keeping the tempo and interval sessions.

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FAQ

Q: I missed a workout. What should I do? A: For an easy run, fit a short easy run in elsewhere that week. For a tempo or interval, leave that day easy and don’t pile a hard session in elsewhere.

Q: My paces feel too fast/slow. Should I adjust? A: Let effort guide you. A tempo that feels too comfortable means you’re slow; if you can’t talk at all, you’re too hard.

Q: I have a niggling shin splint. A: Drop volume by 20%, swap the problem run for cross-training, and work on calves and shins (heel walks, toe raises).

Q: Can I substitute a run with a bike or elliptical? A: Yes, especially on recovery days. Keep intensity low and the duration similar.

Q: How do I fuel on race day? A: Practice the plan during the longest training runs. A standard approach: 30 to 60 g carbs per hour (gel, chews, or sports drink) plus water every 15 to 20 min.

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Closing and workout suggestion

A 1:35 half is more than the clock. The satisfaction is in the miles logged, the early mornings, and the durability you build session by session. Stick with the plan, stay flexible, and notice the wins, a controlled tempo, an injury-free long run, a faster 5K.

Workout of the week: tempo 7 km. Warm up 10 min easy, then 5 km at 4:20/km, cool down 10 min easy. Trains the exact pace you’ll need at the start line, and teaches your body to hold it as tiredness sets in.

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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)