# MET Hours: Challenge Tracker — Exercise, measured in MET hrs

> Exercise, measured in MET hrs (iPhone/iPad app by NATHAN HORGAN.)

- Source: https://appshunter.io/ios/app/met-hours-challenge-tracker/id6789397051 (this page in markdown: same URL + `.md`)
- Developer: [NATHAN HORGAN](https://appshunter.io/developer/1875500852)
- Category: Health & Fitness, Medical
- Price: Free
- Age rating: 12+
- Requires: iOS 17.6 · 2 MB
- Languages: American English
- Released: 2026-07-20
- Data updated: 2026-08-10
- User reviews in markdown: https://appshunter.io/ios/app/met-hours-challenge-tracker/id6789397051/reviews.md

## What is MET Hours?

Exercise cut cancer recurrence risk by 28% in a landmark trial. This app tracks the exact unit that trial measured: MET-hours.

The CHALLENGE Trial followed colon cancer survivors through a structured exercise program. The results, published in the New England Journal of Medicine in 2025: a 28% lower risk of cancer recurrence and a 37% lower risk of death. The trial set its targets in MET-hours, a clinical unit no fitness tracker reports. MET Hours calculates them for you, automatically.

AUTOMATIC FROM YOUR APPLE WATCH
Approve access once and your workouts log themselves: type, duration, energy, and heart rate. After each workout, a notification shows the MET-hours you earned, your weekly total, and your zone. Prefer manual entry? Every workout can be logged by hand instead.

FOUR ZONES, ONE GOAL
Your week climbs through Baseline, Active, Shield, and Peak Resilience. The Shield zone (20+ MET-hours) reflects the trial's target range. A clear weekly gauge shows exactly where you stand and what one more walk would do.

VISCERAL FAT PROTOCOL (OPTIONAL)
Track high-intensity sessions and your time in heart-rate zones 4 and 5, with zones calculated the same way Apple Watch calculates them: from your own resting and maximum heart rate.

REPORTS FOR YOUR CARE TEAM
Share a clean weekly or multi-week summary with your oncologist, physiotherapist, or family.

PRIVATE BY DESIGN
No accounts. No analytics. No servers. The app never connects to the internet. Your health data stays on your device, protected by Apple's on-device security. Always free.

Built for colorectal cancer survivors. The trial studied a supervised three-year exercise program; this app is an educational tracking tool, not a medical device. Always consult your healthcare professional before beginning or changing an exercise program.


## Version history (last 3 releases)

### 1.1.5 — 2026-08-04

A simpler, faster welcome.

• Redesigned onboarding: the trial's result up front, a cleaner interactive demo, and a new "Your data is safe" screen
• One tap now plays the whole sample week, with each workout coloured by the tier it reached
• Refreshed About page with clearer explanations of how MET-hours are calculated
• Design polish throughout

### 1.1 — 2026-07-24

A friendlier welcome and a fresh coat of glass.

• New welcome tour: Feel how MET-hours work with an interactive sample week, connect Apple Health, and preview notifications. Replay it anytime from Settings
• Redesigned Settings and workout entry. Every number now uses the signature wheel pickers
• The weekly gauge now climbs through your zone colours as the week grows, and Baseline wears the icon's purple
• Clearer zone ranges and a new notifications switch in Settings
• Updated trial information: the CHALLENGE Trial's results were published in the New England Journal of Medicine, 2025

### 1.0 — 2026-07-21

No release notes.

---

*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 2026-08-10.*