# NorthPace: HIIT & Breath — 4x4, Guided Breath & Rucking

> 4x4, Guided Breath & Rucking (iPhone/iPad app by Austin Storms.)

- Source: https://appshunter.io/ios/app/northpace-hiit-and-breath/id6766413860 (this page in markdown: same URL + `.md`)
- Developer: [Austin Storms](https://appshunter.io/developer/1896285735)
- Category: Health & Fitness
- Price: Free (on sale, was $0.99)
- Age rating: 4+
- Requires: iOS 26.4 · 35 MB
- Languages: American English
- Released: 2026-06-25
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/northpace-hiit-and-breath/id6766413860/reviews.md

## What is NorthPace?

Northpace is a focused fitness and wellness app for iPhone and Apple Watch. Three workouts, done well — no social feed, no streak pressure, no ads, no account. Open it, do the work, get on with your day.

  THREE WORKOUTS

  • Norwegian 4x4 — the high-intensity interval protocol from published cardiovascular-fitness research: a warm-up, four rounds of four minutes hard and three minutes easy, then a cool-down. Live heart-rate zones, a phase countdown, and pause/skip controls.

  • Breath — twelve guided breathing patterns with a calm animated pace-keeper and optional haptic cues, so you can practice with your eyes closed and custom audio playback for setting your own ambiance: Wim Hof, Box, Resonance, 4-7-8, Physiological Sigh, Triangle, Alternate Nostril, Extended Exhale, Diaphragmatic, Buteyko, Bhastrika, and Kapalabhati. Each pattern’s cadence is grounded in published breathing research. Add your own audio to the breath work and edit it. 

  • Rucking — an open-ended weighted hike with GPS distance, pace, and elevation, a route map colored by your heart-rate zone, and load-adjusted calorie estimates (Pandolf equation).

  HEART RATE, YOUR WAY
  
Take live heart rate from your Apple Watch, AirPods Pro 3, or a Bluetooth chest strap (Polar, Wahoo, Garmin, and more). Every workout is heart-rate-zone driven and saves to Apple Health when you finish.

  MORE
 
 • Readiness — a daily 0–100 read on your recovery from heart-rate variability, resting heart rate, sleep, and recent training.
  • Live Activity on the Lock Screen and in the Dynamic Island.
  • Apple Watch app with live metrics; breathwork haptics keep tapping your wrist even when the screen dims.
  • Independent iPhone and Apple Watch haptic toggles.
  • Bring your own ambient sounds, with per-track trim and fade.

  PRIVATE BY DESIGN
  
No account, no ads, no analytics, no third-party trackers. Your heart rate, workouts, location, and audio stay on your device and in your own Apple Health — we never see them, and the app makes no network connections of its own.

  Northpace is a general fitness and wellness app — not a medical device, and not a substitute for professional medical advice. Talk to your doctor before starting a new exercise or breathing program. Never do breathwork in or near water, while driving, or while standing.


## Version history (last 4 releases)

### 1.1.2 — 2026-08-10

Bug fixes and improvements

### 1.1.1 — 2026-07-26

Bug fixes and improvements.

### 1.1 — 2026-07-03

Rucking calories, rebuilt — and far more accurate.

  Northpace now estimates the calories you burn on a ruck with a model built for walking under load:

  • Pack weight
  • Terrain — new setting: pavement, trail, grass, sand, or snow (soft ground burns far more)
  • Real-time uphill & downhill grade, from GPS
  • Heart rate, calibrated to your VO₂ max when your Apple Watch has measured it

  Your live calorie burn now shows on your Apple Watch during a ruck, too.

  As always: no account, no ads, no analytics — everything stays on your device and in Apple Health.

### 1.0 — 2026-06-26

No release notes.

## More apps by Austin Storms

- [Gutbook: IBS & FODMAP Tracker](https://appshunter.io/ios/app/gutbook-ibs-and-fodmap-tracker/id6766408038)

All apps by Austin Storms: https://appshunter.io/developer/1896285735

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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 2026-08-14.*