# crazyRun: Interval Training — Structured runs, bike & hikes

> Structured runs, bike & hikes (iPhone/iPad app by Irene Juarez.)

- Source: https://appshunter.io/ios/app/crazyrun-interval-training/id6775238206 (this page in markdown: same URL + `.md`)
- Developer: [Irene Juarez](https://appshunter.io/developer/1756478637)
- Category: Sports, Health & Fitness
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 12 MB
- Languages: American English, Arabic, Bangla, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 6 more
- Released: 2026-10-05
- Data updated: 2026-10-09

## What is crazyRun?

crazyRun runs structured workouts on your Apple Watch. Write the session once and the watch does the rest: it tells you at every phase change, calls out your pace every kilometre and lets you run without looking at the screen.

WORKOUTS YOU WRITE AS ONE LINE

Instead of filling in forms, type the session:

10'[Warm-up]+5x(3'[Pace:4:30-4:45]+1'[Rest])+10'[Cool-down]

Ten minutes of warm-up, five three-minute reps at target pace with one minute of recovery, and ten minutes of cool-down. Repeats, phases, intervals by time or distance, target pace or heart rate, and a name for every segment. A plan that needs different settings? Add settings for that workout only (auto-pause, alerts, voice…). And if you prefer, there's a visual editor.

ALERTS THAT DON'T NAG

The watch judges your pace over a 30-second window and only tells you when you're really off target. On long segments it looks at the average: it tells you the pace you need to finish the segment within range. Heart-rate alerts too, by voice, on screen or with haptics.

RUN, BIKE AND HIKE

Three modes, each with its own physics. On the bike you see speed in km/h; running and walking, pace. A 45 km/h descent and a 2 km/h mountain climb are both recorded correctly. Every workout is saved to Health with the right type, its route and the distance crazyRun measures. In kilometres or miles.

BUILT FOR LONG OUTINGS

• Auto-pause that tells stopping from going slowly, using the pedometer as well as GPS. Set per mode.
• Power saving for multi-hour stages: with your wrist down the screen goes almost fully dark, but recording is never touched.
• Spoken cues with adjustable volume, and Digital Crown control.

WHAT IT MEASURES

Pace, distance, time, heart rate and zones, cadence, elevation, calories, estimated power, training load (TRIMP) and heart-rate recovery. Splits per kilometre, per phase and per interval, with each segment coloured by whether you hit the target. Charts, route map, personal records and race predictor.

AFTER THE WORKOUT

History, calendar, trends and side-by-side comparison. Export one workout or a period to GPX (with heart rate), TCX (with a lap for every rep), CSV or JSON. Backups you create and take with you by email, AirDrop, iCloud Drive or the Files app.

YOUR DATA IS YOURS

No account. No sign-up. No servers. No analytics. No ads. Your workouts stay on your iPhone, your watch and in Health. If you turn on sync, they go to YOUR iCloud, not to a server of ours.

IN 16 LANGUAGES

Arabic, Bengali, Chinese (Simplified and Traditional), English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Spanish and Thai.

REQUIREMENTS

iPhone with iOS 17 or later. The Apple Watch app (watchOS 10 or later) records the GPS route; without a watch you can create workouts and run timed ones from the iPhone.

## Is crazyRun safe?

Not enough ratings yet to assess crazyRun.

## Is crazyRun legit?

crazyRun: Interval Training appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for crazyRun is 63 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-05

No release notes.

## More apps by Irene Juarez

- [Pillnoter](https://appshunter.io/ios/app/pillnoter/id6541765548)
- [Gnomotempo](https://appshunter.io/ios/app/gnomotempo/id6755233359)

All apps by Irene Juarez: https://appshunter.io/developer/1756478637

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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 2026-10-09.*