Who this plan is for
- ✓You've run a half marathon between 1:53 and 2:05 and have been running consistently for at least 12 months
- ✓Your comfortable easy run pace is around 6:05–6:45/km (9:46–10:51/mi)
- ✓You can run 12–13 km comfortably and want to extend both distance and structured quality work
- ✓You run 3–5 days per week and want a plan that works around a realistic schedule
- ✓You've tried a free plan and found it either too generic or too vague about why each session exists
- ✓You want to know what threshold training actually means and how it applies to your specific goal
What your training actually looks like
Every session in the plan comes with a plain-English reason, not just a pace. Choose your schedule below to see what Week 1 looks like.
💡 Aerobic foundation: every run should be conversational this week. Easy runs are doing real work — mitochondrial density, fat oxidation, connective tissue conditioning. Miss a session? Skip it and move on.
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Build my Sub 1:50 Plan plan →The four phases
Base phase (weeks 1–3)
Build an aerobic base with easy runs and a weekly long run growing from 12 to 15 km. All runs at conversational pace. Consistency is the only goal.
Strength phase (weeks 4–6)
Introduce weekly tempo runs of 5–6 km at 5:10–5:15/km. Long run reaches 16–18 km. The tempo is the week's centrepiece — everything else supports it.
Speed phase (weeks 7–9)
600m and 800m intervals at 4:50–5:00/km sharpen VO₂max. Long run includes final 2 km at goal pace. Volume peaks at 45–55 km.
Taper phase (weeks 10–12)
Volume drops 30–40%. Quality sessions shorten. You arrive at race day with absorbed fitness and fresh legs — resist the urge to add miles.
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Build my Sub 1:50 Plan →Frequently asked questions
What is goal pace for sub 1:50?
To finish in 1:49:59, you need to average 5:12/km (8:21/mi). Your threshold training sessions will sit at 5:10–5:15/km (8:19–8:27/mi). Easy runs should be noticeably slower — around 6:15–6:50/km (10:03–10:59/mi). The gap between easy and quality pace is where most runners' training fails: running easy too fast means you arrive at tempo sessions already tired.
How do I know if my current fitness supports sub-1:50?
A 5K time under 26:30 or a 10K under 55:30 suggests sub-1:50 is achievable. If you've run a half marathon in 1:58–2:05, sub-1:50 is the right next step with proper structured training. If your most recent half was slower than 2:10, build towards sub-2:00 first.
Can I train for sub 1:50 on 3 days per week?
Yes, but the three sessions must be the right ones: a long run (peak 18–19 km), one threshold tempo (5–6 km at 5:10–5:15/km), and one easy recovery run. Three easy runs will not produce enough training stimulus to drop from 2:00 to 1:50. The quality session is non-negotiable at this target.
What happens if I miss the tempo run?
Reschedule within 48 hours on a fresh day — not immediately after a missed session. If you can't reschedule, skip it entirely. Never run a tempo on tired legs; the adaptation won't happen and the risk of injury is higher. One missed session will not derail a 12-week plan.
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