8-Week Half Marathon Training Plan
A compressed half marathon plan for runners who already have a base. Two levels: Just Finish (experienced runner, no speed work) and Time Goal (sub-2:00 with tempo and intervals). Requires 20+ miles per week to start.
Can You Train for a Half Marathon in 8 Weeks?
Yes, but only if you have an existing running base. An 8-week plan works because you are not building fitness from scratch. You are maintaining your current fitness and adding race-specific preparation on top of it. Think of it as sharpening a blade rather than forging one.
In a standard 12-week plan, the first 3 to 4 weeks are spent building base mileage. If you already have that base, those weeks are unnecessary. An 8-week plan skips the base-building phase and goes directly into race-specific training: long run progression, pace work (for the Time Goal plan), and a taper.
The tradeoff is clear: less margin for error, less time to recover from setbacks, and higher injury risk if you do not have the prerequisite fitness. This plan is not for everyone. Read the prerequisites carefully before starting.
Prerequisites: Do Not Skip This
All four of these must be true before you start this plan. If any one of them is not, use the 12-week plan instead. There is no shame in the longer plan. It is safer and produces better results for most runners.
Running 20+ miles per week
You need a consistent aerobic base. Sporadic running does not count. You should have been at 20+ miles per week for at least 4 consecutive weeks.
Able to run 8 miles comfortably
If your longest recent run is 5 miles, jumping to 10+ mile long runs in a few weeks is a recipe for injury. You need to be able to handle 8 miles without it being a massive effort.
Running 4+ days per week
Your body needs to be adapted to running frequently. If you only run 2 to 3 times per week, the jump to 4 to 5 sessions is too aggressive for an 8-week timeline.
No current injuries
Starting a compressed plan with an existing injury is a guaranteed path to making it worse. Heal fully before beginning any training plan, especially a short one.
Why 8 Weeks Works (With a Base)
You are maintaining, not building
A 12-week plan spends weeks 1 to 4 building aerobic base. You already have that. Your body already handles 20+ miles per week. The 8-week plan starts at your current fitness and adds race-specific work.
Long runs are the key adaptation
The single most important half marathon workout is the long run. In 8 weeks, you have time for 6 progressively longer long runs (weeks 1 to 6), a reduced long run (week 7), and a race (week 8). That is enough stimulus for a trained runner.
Speed work is optional for completion
If your goal is simply to finish, you do not need tempo or interval sessions. The Just Finish plan uses only easy runs and long runs. Removing speed work frees up recovery capacity and reduces injury risk.
One recovery week is sufficient
Longer plans have 2 to 3 recovery weeks. With an 8-week plan, one recovery week (week 4) is enough because you started with a trained body. The abbreviated taper (1 week instead of 2) also reflects your existing fitness.
Choose Your Level
Just Finish
Experienced runner, completion goal
Time Goal
Targeting sub-2:00 with speed work
Weekly Mileage Progression
Level 1: Just Finish
This plan is for experienced runners who decided to enter a half marathon with limited time to prepare. Maybe you signed up late, or life got busy and you only have 8 weeks left. You have the base fitness. This plan turns that base into half marathon readiness with 3 run days per week, no speed work, and a focus on the long run. All runs are at easy, conversational pace.
Level 2: Time Goal (Sub-2:00)
This plan is for runners with a strong base who want to race, not just finish. It includes one quality session per week (tempo or intervals) and long runs with race-pace finishes. Weekly mileage peaks at 34 miles in week 6. The single quality session per week is intentional. With a compressed timeline, adding more fast running increases injury risk without proportional fitness gain.
The 1-Week Taper: Why It Works
Standard half marathon plans use a 2-week taper. This plan uses a 1-week taper. Here is why that is fine for this specific situation.
A 2-week taper exists because a 12 to 14 week build creates significant accumulated fatigue. Your body needs extra time to absorb all that training. With an 8-week plan, you have less accumulated fatigue because you trained for fewer weeks. Your body needs less recovery time. One week of reduced volume, combined with your existing fitness, is enough to show up ready to race.
Week 7 taper checklist:
Reduce total mileage by 35 to 40% from your peak week
Keep one short quality session (strides, not a full tempo)
Long run drops to 8 miles, easy effort only
Sleep at least 8 hours every night
Increase carbohydrate intake by 15 to 20% in the last 3 days
No new shoes, no new food, no new gear this week
Light strength training early in the week only
What to Cut If You Miss a Week
With only 8 weeks, every week matters. But life happens. Here is how to adjust if you miss training time, depending on when it happens.
Week 1 to 2
Impact: LowPick up where you left off. You have not built any plan-specific fitness yet, so missing a week here just means you start with one fewer week of preparation.
Week 3
Impact: ModerateSkip the missed quality session. Do not try to combine week 3 and week 4 workouts. Resume with week 4 as a recovery week and continue normally.
Week 4 (Recovery)
Impact: LowThis is actually fine. You were supposed to reduce volume anyway. Take the week completely off if needed, then resume with week 5 as planned.
Week 5 to 6
Impact: HighThese are your peak weeks. Missing one means you lose your most important training stimulus. Drop your time goal by 5 to 10 minutes and run for completion. Do not try to cram peak workouts into the taper.
Week 7 to 8
Impact: ModerateIf you miss week 7 (taper), that is actually extra rest. If you miss race week runs, just do a 2-mile shakeout the day before the race and go. Your fitness is already built.
Injury Risk Management
A compressed plan inherently carries more injury risk than a longer one. You are asking your body to adapt on a tighter schedule. These five practices significantly reduce that risk.
Warm up before every quality session
5 to 10 minutes of easy jogging plus dynamic stretches (leg swings, high knees, butt kicks). Cold muscles and compressed timelines are a bad combination.
Strength train twice per week
15 minutes is enough. Single-leg squats, lunges, calf raises, planks, and glute bridges. These exercises shore up the weak links that break under compressed training loads.
Sleep 7 to 8 hours minimum
Recovery happens during sleep. With a compressed plan, you are asking your body to adapt faster than normal. Sleep is the single most effective recovery tool you have.
Use the 2-run rule
If something hurts during a run but goes away within the first 10 minutes, it is probably fine. If it hurts during 2 consecutive runs, take 2 to 3 days off. Do not push through persistent pain.
Do not add volume beyond the plan
This plan is already aggressive. Adding extra runs, longer long runs, or more speed work because you "feel good" is how compressed plans lead to injury. Follow the plan exactly.
About This 8-Week Half Marathon Training Plan
This is a free 8-week half marathon training plan published by Motera, a gamified running app for iOS. The plan is specifically designed for runners who already have a running base of 20 or more miles per week and can comfortably run 8 miles. It is not suitable for beginner runners or those without an established running habit.
The plan includes two levels. Level 1 (Just Finish) uses 3 runs per week with no speed work, peaking at 20 miles per week. Level 2 (Time Goal) uses 4 to 5 runs per week with weekly tempo or interval sessions, peaking at 34 miles per week and targeting a sub-2:00 finish. Both plans include a recovery week at week 4 and an abbreviated 1-week taper at week 7.
The compressed timeline works because runners with an existing base do not need the base-building phase that occupies the first 3 to 4 weeks of a standard 12-week plan. The plan goes directly into race-specific preparation: progressive long runs, optional quality sessions, and a taper. Runners who need more time should use the 12-week half marathon training plan instead.
8 Weeks of Runs, Zero Boredom
Training on a compressed schedule means you need every run to count. Motera makes sure none of them feel wasted. Each run captures territory on a real map, earns XP, and pushes you up the leaderboard. Your easy Tuesday 4-miler becomes a strategic mission to expand your zone.
When you only have 8 weeks, motivation matters. Motera keeps you lacing up because every run has a purpose beyond just checking a box on your training plan.
MoteraFrequently Asked Questions
Can you train for a half marathon in 8 weeks?
Yes, but only if you already have a solid running base. You should be running at least 20 miles per week and able to comfortably run 8 miles in a single session before starting this plan. If you are starting from scratch or running fewer than 15 miles per week, an 8-week timeline is too aggressive and you should use a 12-week plan instead.
What running base do I need for an 8-week plan?
You should be consistently running 20 or more miles per week for at least the past 4 weeks. You should be able to run 8 miles without stopping. You should be running 4 or more days per week. If you meet all three of these conditions, you have enough fitness to safely compress half marathon training into 8 weeks.
Why does the 8-week plan only have a 1-week taper?
Because you are maintaining fitness rather than building from scratch, your body does not accumulate the same level of training fatigue that a 12-week buildup creates. A single week of reduced volume is sufficient for your body to recover and arrive fresh on race day. The taper drops mileage by about 40% in that final week.
What happens if I miss a week during the 8-week plan?
Missing one week out of eight is significant. If it is early in the plan (weeks 1 to 3), you can usually pick up where you left off. If it is during the peak weeks (weeks 4 to 6), skip the missed quality session entirely and do not try to double up. If you miss week 7 or 8, consider dropping your time goal and running for completion only. Never compress two weeks of training into one.
Is the 8-week plan riskier for injuries than a longer plan?
Yes, a compressed plan carries higher injury risk because there is less time for your body to adapt to increasing demands. That is why the prerequisite base is so important. To mitigate the risk, do not increase weekly mileage by more than 10% between consecutive hard weeks, take the recovery week in week 4 seriously, and listen to your body. Persistent pain (not just soreness) is a signal to take an extra rest day.
Should I do speed work on the Just Finish plan?
No. The Just Finish plan deliberately excludes speed work. With only 8 weeks and 3 to 4 runs per week, your priority is building long run endurance and arriving at the start line healthy. Adding speed work on top of a compressed schedule increases injury risk without meaningful benefit if your only goal is to finish.
How do I manage injury risk with a compressed timeline?
Four key strategies: First, warm up for 5 to 10 minutes with easy jogging before any quality session. Second, do 10 to 15 minutes of strength work (single-leg exercises, planks, glute bridges) twice per week. Third, sleep at least 7 to 8 hours every night since recovery happens during sleep. Fourth, if something hurts for more than 2 consecutive runs, take 2 to 3 days completely off. Losing 2 days is better than losing 2 weeks to an injury.
Can I use the 8-week plan for a sub-1:30 half marathon?
The Time Goal plan is designed for runners targeting sub-2:00. If you are aiming for sub-1:30, you likely need a 12 to 16 week plan with higher mileage (40+ miles per week) and more specialized workouts. Running sub-1:30 requires a strong aerobic base that takes time to build and cannot be safely compressed into 8 weeks for most runners.
