Chasing 2:15 – A 12‑Week Half Marathon Journey
The goal
A 2:15 half means holding 7:00 min/mile (or 4:21 min/km) over the full 13.1 miles. Wait, that pace is too fast for 2:15. The math here corrects to roughly 10:18 min/mile (about 6:23 min/km). To make that work you need aerobic fitness, tactical pacing, and the head to hold a “comfortably hard” effort for more than two hours.
Pre-requisites
Before starting, confirm at least one:
- Complete 5 mi at easy effort without stopping.
- Run a 10K in 55 minutes or under (about 8:50 min/mile).
- Sustain 15 to 20 mi of running per week for the last three weeks.
If you check one, you’re set. If you’re close, spend two weeks building base with easy runs and strides first.
How the plan works
| Workout | Purpose | Typical pace / effort |
|---|---|---|
| Easy run | Build aerobic base, support recovery | 60–70% max HR, about 8:30–9:30 min/mile |
| Tempo run | Raise lactate threshold, train “comfortably hard” effort | 85–90% max HR, about 7:10–7:20 min/mile |
| Interval | Boost VO₂ max and speed | Hard (90–95% HR), 5K–10K pace (about 7:00 min/mile) with equal jog recovery |
| Long run (LSD) | Build endurance, practice fueling | Easy pace, 60–70% HR. Add 10–15% distance each week. |
| Recovery / rest | Allow adaptation, prevent injury | Complete rest or light cross-training (cycling, swimming, yoga) |
| Cross-training | Build general fitness, give joints a break | 30–45 min moderate effort (elliptical, bike) |
Weekly plan (12 weeks)
| Week | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| 1 | Rest | Easy 4 mi | Tempo 3 mi (incl. 2 mi @ 7:20) | Easy 4 mi | Rest or cross-train | Long 7 mi | Rest |
| 2 | Rest | Easy 5 mi | Intervals 4×800 m @ 7:00 / 400 m jog | Easy 4 mi | Rest or cross-train | Long 8 mi | Rest |
| 3 | Rest | Easy 5 mi | Tempo 4 mi (incl. 3 mi @ 7:15) | Easy 5 mi | Rest or cross-train | Long 9 mi | Rest |
| 4 | Rest | Easy 5 mi | Intervals 5×800 m @ 7:00 / 400 m jog | Easy 5 mi | Rest or cross-train | Long 10 mi | Rest |
| 5 | Rest | Easy 5 mi | Tempo 5 mi (incl. 4 mi @ 7:10) | Easy 5 mi | Rest or cross-train | Long 11 mi | Rest |
| 6 | Rest | Easy 6 mi | Intervals 6×800 m @ 7:00 / 400 m jog | Easy 5 mi | Rest or cross-train | Long 12 mi | Rest |
| 7 | Rest | Easy 6 mi | Tempo 5 mi (incl. 4 mi @ 7:05) | Easy 5 mi | Rest or cross-train | Long 13 mi | Rest |
| 8 | Rest | Easy 6 mi | Intervals 4×1 mi @ 7:00 / 800 m jog | Easy 5 mi | Rest or cross-train | Long 10 mi (cut-back week) | Rest |
| 9 | Rest | Easy 6 mi | Tempo 5 mi (incl. 4 mi @ 7:00) | Easy 5 mi | Rest or cross-train | Long 14 mi | Rest |
| 10 | Rest | Easy 6 mi | Intervals 5×1 mi @ 7:00 / 800 m jog | Easy 5 mi | Rest or cross-train | Long 15 mi | Rest |
| 11 | Rest | Easy 5 mi | Tempo 4 mi (incl. 3 mi @ 7:00) | Easy 4 mi | Rest or cross-train | Long 10 mi (taper start) | Rest |
| 12 | Rest | Easy 4 mi | Light intervals 3×400 m @ 7:00 | Easy 3 mi | Rest | Race day, half marathon | Rest |
Detailed workout descriptions
Easy run. Stays conversational; breathing allows normal speech. A run-walk approach works if you need to stay in zone. The point is adding distance without depleting your reserves.
Tempo run. 1 mi easy, then the tempo segment at comfortably hard (short sentences possible, full conversations aren’t), then 1 mi easy. You’re training the pace you can hold for 20 to 30 minutes.
Interval session. Warm up 1 to 2 mi, then run the repeats at 5K race pace (about 7:00 min/mile) with equal recovery jog. 1 mi cool-down. Sharpens speed and VO₂ capacity.
Long run (LSD). Steady, easy pace where conversation flows. Mileage and time on feet matter most, not speed. Walk briefly or stretch if needed. Use these runs to test fueling: gels, sports drinks, real-world nutrition.
Cross-training. Low joint stress, aerobic zone: cycling, swimming, elliptical. 30 to 45 minutes, no heavy leg work the day before a key workout.
Rest / recovery. Full rest days matter. If soreness lingers, a gentle walk or yoga session improves circulation without adding stress.
Notes and tips
- Progression: cap weekly mileage growth at 10% to reduce injury odds.
- Listen to your body: persistent tiredness? Swap the hard day for easy running or rest.
- Fueling: test gels and carb drinks once long runs hit 8 mi. Aim for 30 to 60 g carbs per hour.
- Strength: two or three times a week, core, glutes, hamstrings.
- Sleep and hydration: 7 to 9 hours, drink steadily. The gains happen when you’re not running.
- Pacing tools: a heart-rate monitor or effort scale beats relying only on watch pace.
- Adaptability: if race day moves earlier, slide the taper (weeks 11 to 12) forward and keep the final long run at 10+ miles.
FAQ
Q: I missed a hard workout. Should I do it later in the week? A: Stick to the weekly structure. If you skipped a tempo, replace with easy running and keep the next hard session on schedule. Avoid two tough workouts back to back.
Q: My current 10K pace is 8:30 min/mile. Can I still attempt 2:15? A: Within reach. Add two weeks of base building and focus on speed work to bring your 5K and 10K times down.
Q: How do I adjust paces for hot weather? A: Dial intensity back 5 to 10% or swap pace targets for heart-rate zones. Hydration and early starts matter more.
Q: I’m prone to shin splints. Any modifications? A: Swap one run for low-impact cross-training, use more walk breaks, and check footwear for proper arch and cushioning.
Q: Should I do a “dress rehearsal” race? A: A 5K or 10K two to three weeks out builds confidence. Keep the effort below true race-day intensity.
Closing and workout suggestion
A 2:15 half is more than fitness. It reshapes you as a runner. Discipline, smart pacing, and paying attention to your body. These 12 weeks will carry you past 13.1 miles.
This week, run an easy 4 mi at conversational pace (8:30–9:30 min/mile), add 5 × 30-second strides (full recovery between), and finish with a 5-minute stretch.
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)
Collection - 12‑Week Half Marathon Training Plan (Weeks 1‑4)
Week 1 – Easy Run (4 mi)
View workout details
- 805m @ 6'13''/km
- 1.6km @ 5'36''/km
- 3.2km @ 5'26''/km
- 1.6km @ 5'45''/km
Week 1 – Tempo Run (3 mi)
View workout details
- 0.0mi @ 9'40''/mi
- 0.0mi @ 7'20''/mi
- 0.0mi @ 9'40''/mi
Week 1 – Interval Session
View workout details
- 1.6km @ 5'54''/km
- 4 lots of:
- 800m @ 4'21''/km
- 2min rest
- 1.6km @ 5'54''/km
Week 1 – Long Run (7 mi)
View workout details
- 5min @ 6'40''/km
- 11.3km @ 5'26''/km
- 5min @ 6'40''/km
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