Start with the constraint, not the target time
You've run a half marathon before, maybe several, and you're ready for more than just finishing. If you can currently run 20-25 miles per week and have completed at least one half marathon, you're ready for this training approach.
What Makes This Plan Different
This framework is intended for runners with consistent recent mileage who want to prepare for a specific half-marathon effort. It incorporates tempo runs to raise lactate threshold, speed work to improve running economy and VO2 max, deliberate recovery around the most demanding sessions, and race-specific workouts to prepare for sustained hard effort. You'll run 4-5 days per week with cross-training options, building from 25 to 40 miles per week at peak.
The Path to a Half Marathon PR
Over twelve weeks, the block shifts from general durability toward race-specific work. A personal record is never guaranteed; the practical aim is to improve the evidence you can use for pacing decisions.
Building on Your Base (Weeks 1-4)
Starting from a base of 25-30 miles per week, add two quality workouts each week: tempo runs and speed work. Easy mileage alone hits diminishing returns — getting faster requires training the body to handle lactate buildup, improve running economy, and raise VO2 max.
Tempo pace is "comfortably hard": you can speak a few words but not hold a conversation, roughly 30 seconds per mile slower than 10K race pace. Speed work starts with short intervals at 5K pace — 400-800 meter repeats with equal rest — hard but manageable, not sprinting.
Intensifying the Load (Weeks 5-8)
Mileage climbs to 30-35 miles per week. Tempo runs extend to 30-40 minutes at goal half marathon pace, and speed sessions evolve into mile repeats or hill repeats. Weekend long runs extend to 10-12 miles and start incorporating race-pace segments, teaching your body what goal pace feels like when you're already tired — the situation you'll face on race day.
Peak Training (Weeks 9-10)
These are the toughest weeks: 35-40 miles, long runs up to 13 miles, and workouts like 1000-meter repeats at 10K pace. Race-pace tempo runs of 5-8 miles build the tolerance to hold goal pace while uncomfortable, which is what mile 9 on race day will demand.
The Taper and Race (Weeks 11-12)
Volume drops to 20-30 miles while keeping some intensity through short, sharp workouts. The final two weeks let the body fully absorb the training stress — muscle repairs, glycogen stores top off, fatigue dissipates. Keep sleep and meals consistent, avoid adding compensatory workouts, and rehearse the opening miles of the pacing plan.
Key Workout Types Explained
Tempo runs raise the pace you can sustain before lactate accumulates. Warm up 10-15 minutes easy, run 20-40 minutes at a pace where you can speak 1-2 words but not sentences (85-90% max heart rate), then cool down 10 minutes. Start at 20 minutes and add 5 minutes every two weeks.
Interval training — short, fast repetitions with recovery between — improves VO2 max, running economy, and mental toughness. Sample workouts: 8-12 x 400m at 5K pace with 90 seconds rest; 4-6 x 1 mile at 10K pace with 2-3 minutes rest; 6-8 x 1000m at 10K pace with 90 seconds rest. Recovery should be long enough to hit target pace on every rep.
Long runs build aerobic capacity and mental endurance at easy conversational pace (60-70% max HR). Every 3-4 weeks, run the last 2-3 miles at goal race pace, and practice race-day nutrition and pacing on these runs. Peak long run is 12-13 miles, not the full race distance.
Recovery runs are 3-5 miles at a pace you could hold for hours — slower than you think — run between hard workouts to promote blood flow without adding fatigue.
Weekly Training Structure
A build-phase week might look like this:
Monday: Rest or easy cross-training (30-45 min)
Tuesday: Tempo run (10 min warm-up + 30 min tempo + 10 min cool-down)
Wednesday: Easy recovery run (4-5 miles, very comfortable)
Thursday: Interval workout (10 min warm-up + 6 x 1000m at 10K pace + 10 min cool-down)
Friday: Rest or easy 3-4 miles
Saturday: Easy run (5-6 miles)
Sunday: Long run (10-12 miles, mostly easy with last 2-3 miles at race pace)
Pacing Strategy for Race Day
For miles 1-3, run 10-15 seconds slower than goal pace — you'll be fresh and full of adrenaline, and banking time early almost always backfires. The race doesn't really start until mile 3.
For miles 4-10, settle into goal pace and hold it. These miles define the race; steady effort here sets up a strong finish.
For miles 11 through the finish, if you've paced well you should be able to maintain or slightly increase pace. This is where you pass people instead of getting passed.
Nutrition and Hydration for Half Marathon Performance
Daily: 4-6g carbohydrate per kg body weight, 1.2-1.6g protein per kg, 1-1.5g fat per kg, and roughly half your body weight in ounces of water.
Before workouts, a light snack 60-90 minutes out (banana, toast, energy bar); before long runs, a full breakfast 2-3 hours out with familiar foods. Runs under 75 minutes need only water; runs over 75 minutes need 30-60g carbs per hour from gels, chews, or sports drink.
On race day: a 300-500 calorie meal of familiar foods 2-3 hours before, one gel at mile 5 and mile 9 (practiced in training), and small sips at every aid station, including the early ones.
Training Metrics That Matter
Track easy-run heart rate (target 60-70% max HR — dropping over time at the same pace signals improving fitness), tempo pace at a given heart rate (faster pace at the same effort means improved threshold), whether long runs finish faster than they start, and resting heart rate or general fatigue as a recovery signal.
Common Training Mistakes to Avoid
Running every session at a moderate pace defeats the purpose — make easy days truly easy and hard days hard, with no grey-zone running. Skipping recovery runs and rest days removes the time when adaptation actually happens. Never practicing race pace leaves you guessing what goal effort feels like on race day, so build race-pace segments into long runs. Inconsistent training — alternating zero-run weeks with 50-mile weeks — is worse than four steady, moderate weeks. And strength training supports running economy and physical capacity, but it doesn't make a runner injury-proof.
Managing injury risk for intermediate runners
As mileage and intensity increase, so does injury risk. Warm up dynamically for 5-10 minutes (leg swings, lunges, high knees) before every run, and cool down with 5 minutes of walking plus static stretching after. Train glutes, hips, and core twice a week. Slight soreness is normal; sharp pain means rest and assessment. Replace shoes every 300-400 miles.
The Mental Side of Racing Faster
Racing faster means being uncomfortable, so practice that discomfort in workouts rather than meeting it for the first time on race day. Check splits at mile markers without obsessing over them between markers, and race your own race rather than getting pulled into someone else's early pace. Know your intended opening effort, where you'll take fluids, and what you'll adjust if conditions run warmer or windier than expected.
How kovaa presents intermediate training
kovaa places the phase, weekly schedule, workout purpose, duration, structure, and effort target in one plan. Set the days you can train, review how the harder sessions relate to the long run, and reschedule with adjacent work visible. Imported Apple Health activity can provide completed-workout context.
The app does not guarantee a personal record or prevent injury. The athlete still has to judge symptoms, conditions, recovery, and whether the prescribed effort is appropriate that day.
Evaluate the block as a whole
An intermediate block should be judged by whether the faster work improves while the easy running and long run remain absorbable. A target time is useful only when recent training continues to support it.
Use the half-marathon plan to compare the phase structure and weekly demand with your current routine.
