# kaizen \| Adaptive Run Training — 5K, 10K & Marathon Plans

> Data-driven running coach for personalized training and race predictions. (iPhone/iPad app by Run Kaizen LTD.)

- Source: https://appshunter.io/ios/app/kaizen-adaptive-run-training/id1638679224 (this page in markdown: same URL + `.md`)
- Developer: [Run Kaizen LTD](https://appshunter.io/developer/1638679226)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Rating: 4.70/5 from 27 App Store ratings · 85 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 82 MB
- Languages: American English
- Released: 2022-10-28
- Data updated: 2026-08-25
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/kaizen-adaptive-run-training/id1638679224/reviews.md

## What is kaizen | Adaptive Run Training?

kaizen builds your training from the running you've done, and sets you the weekly training load you need to achieve to reach your goal.

Connect Strava, Garmin or Apple Health and kaizen turns your recent training and race history into clear guidance for the week ahead. See what your current training suggests is possible, train toward your goal with more confidence, and build consistency without losing sight of real life.

Train for a 5K, 10K, half marathon or marathon — or train at a rate of improvement that helps you keep getting better over time.

Whether you’re building toward race day or focusing on steady long-term progress, kaizen helps you train with more context, more clarity and less noise.

CHOOSE HOW YOU WANT TO TRAIN

The first training systems in kaizen give you more structure and guidance without the brittleness of a rigid plan.

Start with:

- Blank Canvas for full flexibility
- Even Spread for a calm, repeatable weekly rhythm
- 1 Long, 1 Hard for a week anchored by one longer run and one harder effort

You choose the structure that fits you. kaizen adapts the work underneath based on your current fitness, goal and timeline.

WHAT YOU GET

- Race predictions for 5K, 10K, half marathon and marathon
- Guidance shaped by your recent training and race history
- Flexible weekly training that adapts to the running you do
- More structure without being locked into a plan that breaks when life gets in the way
- Clearer confidence about the shape you are in before race day
- A way to train not just for one race, but for steady long-term improvement

BUILT AROUND CONSISTENCY

kaizen is built around a simple idea: improvement comes from enough good work, repeated consistently, for long enough.

The point is not to blindly obey numbers or feel like you’ve failed the week because life got in the way. The point is to understand the bigger picture, stay consistent, and make better decisions over time.

Some weeks will be smooth. Some will be messy. Missing a run or having a rough patch does not erase the work. kaizen helps you stay oriented, return well, and keep building.

Because the best training is not the most ambitious plan on paper. It is the training you can actually absorb alongside work, family, stress, sleep, travel and everything else that affects running.

DESIGNED FOR REAL LIFE

Some runners want full freedom. Some want a steadier rhythm. Some want more weekly shape. kaizen is designed to support different ways of training while keeping the same adaptive logic underneath.

The goal is not perfect compliance. The goal is durable progress.

CONNECT VIA STRAVA OR GARMIN

kaizen adapts based on the running you do, so it requires a data connection to update based on your actual training. It’s currently compatible with Strava and Garmin. You’ll need to connect your Strava or Garmin account for kaizen to analyse your activities and calculate your predictions and training guidance.

kaizen does not process or store location data.

Read the terms and conditions here: https://runkaizen.com/terms

Read the privacy policy here: https://runkaizen.com/privacy

## Key features

- Data-driven training partner
- Dynamic weekly distance targets
- Personalized fitness calculations
- Race predictions for various distances
- Flexible training plans
- Build consistency and improve fitness

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Quarterly Subscription | $34.99 | per 3 months |
| Annual Subscription | $89.99 | per year |
| Monthly Subscription | $14.99 | per month |
| Annual Subscription | $89.99 | per year |
| Quarterly Subscription | $34.99 | per 3 months |
| Monthly Subscription | $14.99 | per month |
| Subscription | $12.99 | per month |
| Subscription | $89.99 | per year |
| Subscription | $89.99 | per year |
| Subscription | $24.99 | per 3 months |
| Subscription | $69.99 | per year |
| Subscription | $14.99 | per month |
| Subscription | $49.99 | per year |
| Subscription | $19.99 | per 3 months |
| Subscription | $12.99 | per month |


## What do users think of kaizen | Adaptive Run Training?

Overall sentiment: mixed

**Pros**

- ✨ Adaptive and flexible training
- 🎯 Accurate race predictions
- 📈 Helps with improvement and progress
- 💡 Simple and effective concept
- 🤝 Good customer support
- 🏃‍♂️ Motivates users to run
- 📱 Clean and well-designed UI
- 🚀 Makes training easy
- 👍 Great for structured training
- 💯 Highly recommended by users

**Cons**

- 🐛 Very buggy and unstable
- 📉 Inaccurate predictions sometimes
- 🤔 Confusing to understand and use
- 💰 Expensive subscription fee
- ⏳ Lacks advanced features
- 🚫 Difficult to plan training
- ⚠️ Unrealistic mileage targets
- 🔄 Inconsistent recommendations
- 👎 Overly basic for some users
- 📱 Can't edit runs

**Commonly reported bugs**

- Setup process crashes or loops
- App crashes frequently
- Mileage calculations are incorrect
- Planned mileage doesn't add up correctly
- App doesn't get past the first step
- Race prediction screen freezes
- App doesn't work at all
- Data imports incorrectly (mileage/pace)
- Issues with unit conversion (miles/kilometers)
- Subscription charge without reminder
- Weekly targets change based on paces
- Only shows one week ahead
- Can't get past prediction screen
- Stuck on loading stage
- Imported Strava data is wonky
- Race predictor only gives marathon distance prediction
- Training days logged as previous day
- Cannot control subscription
- Inconsistent distance recommendations
- Records disappear and reappear
- Improve prediction section hides event selection
- Week planning tool shows wrong paces
- Marathon goal always defaults to 2:00:00
- Can't consistently log in
- App is immature and has bugs

**Most requested features**

- Allow editing of runs
- More personalization in training plans
- Ability to start the training week on different days
- Consider elevation in training calculations
- Add more workout suggestions and paces
- Predict times for distances other than marathon
- FAQ and tutorials for better understanding
- Ability to plan runs in decimals
- Integration with other platforms beyond Strava

## Recent user reviews (10 of 85)

All indexed reviews: https://appshunter.io/ios/app/kaizen-adaptive-run-training/id1638679224/reviews.md

### 5/5 — Wow !!!!

*2026-08-16*

Best running app i‘ve ever test

### 2/5 — Awfully inconsistent

*2026-06-04, version 1.7.4*

This has to be one of the worst running apps I’ve ever used.

The imbedded mathematics in this thing just don’t make sense.
First: it’s just bad at simple math. Like, it’ll tell me I have 29k left to run but I have 1 14k run left on my weekly schedule. 
Second: Everytime I open the app to look at my next run, it’s changed. I JUST opened it to see I was running 17.7k today and then when I went to look again, moments later, it now said I was supposed to run 12.3k.
Third: the pace calculator doesn’t work more than once at a time. If you check for a marathon pace and then try to go for another race distance, it won’t work. You have to close the app entirely.

I’m so happy I only paid for one month (which btw It kept telling me I hadn’t paid but it dinged me anyway so if I wouldn’t have known to just close the app and start again it would have charged me twice) because I will not be continuing with this.

Awful.

### 1/5 — Seriously buggy

*2026-05-13*

Set up process crashed or looped me around like 4 times and required to close and reopen the app. Also seems super basic compared to stuff like Runalyze which is infinitely cheaper with tons more info. I can’t recommend but if it works for you I don’t judge.

### 5/5 — Amazing platform and support

*2026-05-02, version 1.7.1*

I’ve tried every app from Runna to VDot to manual programming. I have a crazy work schedule and kids and often find it time to do prescribed runs on a schedule. Kaizen is the most adaptive training app I’ve ever seen. Not only does it adapt to what you do, it easily adapts to your life. 

When I had a question, Kaizen support reached back and answered my questions immediately. 

10/10 app. Highly recommended for anyone who cares about running.

### 5/5 — Great app

*2026-04-22, version 1.6.3*

I like how this app leaves me to train the way I want, but still gives good predictions that adjust directly with my recent training volume and intensity. Switched from Runna and am very happy with it.

### 5/5 — Love Kaizen

*2026-04-20*

Kaizen is the only app that’s kept me structured, motivated, and actually improving.

**Developer response:** awesome, glad to hear it's working for you!

### 1/5 — Useless app

*2026-01-21, version 1.5.11*

Not sure how this app works. I just run a 20min 5k as part of training and the app says under ideal conditions I would do 21 minutes. For the rest it doesn’t really offer anything at all

### 5/5 — Prediction

*2026-01-18, version 1.5.11*

Got my 5k race prediction spot on (predicted 17:58 and I ran a 17:59)

### 2/5 — Unfortunate bugs

*2026-01-06*

Love the concept but it’s hard to trust the app when it is presenting different mileage recommendations every other day and it can’t seem to add up my planned mileage correctly.

It went from recommending 55 miles this week to now saying I have 19 miles remaining after one 8 mile run.
It also reads that I have 7.5 unplanned miles despite having 52 miles planned.

**Developer response:** hey there, thanks for flagging. could you please contact support from within the app so we can see what's going on there. the mileage target is a training load target under the hood, so distance will jump around at the beginning of the week as it is sensitive to intensity changes. that does sound like it's jumping around more than it should, so keen to look into your account to see what's happening there! we did have some issues in the planner when in miles, which are resolved in our upcoming release (early next week). look forward to sorting all of that out for you asap :)

### 5/5 — Best Race Performance Predictor

*2025-12-15*

This app has really given me the confidence in my training being on track and about what I could achieve come race day.

## Frequently asked questions about kaizen | Adaptive Run Training

### What does Kaizen | Data-Driven Running do?

Kaizen analyzes your past running data, typically by connecting to your Strava account, to determine your current fitness level. Based on this, it sets dynamic weekly distance targets and provides race predictions for distances like 5k, 10k, half marathon, and marathon. The app aims to guide you towards achieving your running goals and improving your performance.

### How does the app personalize my training?

The app creates hyper-personalized training by crunching your running history to calculate your actual current fitness. It then sets a dynamic weekly distance target that is sustainable for you, based on your average intensity and cross-training from previous weeks. This means your target adjusts based on how hard or easy you run, ensuring you can meet your training load.

### What are the subscription costs for Kaizen?

The app offers subscription options. For users in the United Kingdom, pricing is £12.99 per month, £29.99 for 3 months, and £79.99 per year. Pricing may vary in other countries. A free trial is available to experience the benefits before committing to a subscription.

### What devices or services is Kaizen compatible with?

Currently, Kaizen is compatible with Strava. You need to connect your Strava account for the app to process your activities, calculate predictions, and set targets. The app does not process or store your location or heart rate data.

### Can I use this app if I'm not training for a race?

Yes, Kaizen is also designed for runners looking to improve their general fitness and consistency. The app can set plans to help you maintain your fitness or actively improve it if you're dedicated to getting faster. It focuses on building consistency step-by-step, fitting into your life.

## Version history (last 5 releases)

### 1.7.9 — 2026-08-24

Bug fixes, performance improvements, and improved way to share your current fitness & stats.

### 1.7.7 — 2026-07-22

We've got loads of great updates for you:
- "Build You Own" is our latest training system; adding more flexibility than ever
- You can now plan tune up races on the journey to your main race
- Customise your referral code
- Look back at your training block from past races

### 1.7.6 — 2026-07-04

- Workouts: choose from a selection of structured workouts when you're planning your week
- Training simulator: calculate the exact amount of training you need to do to achieve a certain goal, so you can work out what's realistic for your race

### 1.7.5 — 2026-06-24

Version 1.75 includes a lot of great updates.
- You can now connect Apple Health and import all your training data directly.
- The doughnut is more accurate than ever, with plenty of improvements to make planning your week easier than ever before. 
- A brand new way of viewing your training weeks graph; you can now pick between distance or training load 
- Several bug fixes and performance improvements.

### 1.7.4 — 2026-05-19

Minor bug fixes.

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## Related topics

[kaizen](https://appshunter.io/ios/topics/kaizen) · [adaptive training plans](https://appshunter.io/ios/topics/adaptive-training-plans) · [adaptive training](https://appshunter.io/ios/topics/adaptive-training)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*