Choose your mountain
Pick from five peaks — from beginner-friendly Grouse Mountain to expert-only Everest. Select a workout program and how long you have: 20, 30, 45, or 60 minutes.
Heart-rate game · Apple Watch
Your heart is the controller. The mountain is waiting.
Cardio Command turns your real heart rate into altitude. Stay in the target zone, score points, and climb five mountains — each harder than the last. Built on real interval training science.
How it works
Three steps from your couch to the summit.
The only gear you need is your Apple Watch and a willingness to work for it.
Climb
Your Watch reads your heart rate every ~5 seconds. The zone bar shows your climber rising and falling on the mountain cross-section. Stay inside the highlighted band — that's your altitude.
Earn your Summit Card
Every climb generates a unique card: your HR trace drawn as a mountain silhouette, your score, your time in zone, and any badges earned. Share it from your Watch or iPhone.
The game
Cardio science. Game brain.
Five mountains
Grouse Mountain, Mount Whitney, Kilimanjaro, K2, and Everest. Each unlocks after the one before it. Zone widths shrink and warning times cut as you climb higher.
Nine workout programs
Norwegian 4×4, Tabata, Pyramid, Tempo, Zone 2, Wild Peaks (Fartlek), and more — every one a real interval protocol, just with a mountain on top.
Dynamic events
Rockfall narrows your zone. Altitude Sickness drops it. Whiteout hides your HR entirely — navigate by feel. Each event lasts 30–60 seconds and changes everything.
Summit Card
Your heart rate over time is drawn as a mountain skyline. Every climb looks different. Share from your Watch right after, or view the full-resolution version on your iPhone.
12 badges
Summit Track, Precision Track, Event Track. Complete all five mountains. Hold 90% in-zone on Expert. Survive a full Whiteout without leaving the band. Each has a story behind it.
iPhone companion app
Your full climb history, achievement grid, lifetime stats, and a high-res Summit Card export for Instagram Stories — all waiting on your phone when you get back.
The mountains
Start beginner. Work up to Everest.
Each mountain is harder than the last — tighter zones, shorter warning windows, less margin for error.
🏔️
Grouse Mountain
Beginner
Wide zones, long warnings. A good place to learn the game and build your base.
🏔️
Mount Whitney
Intermediate
Zones tighten up. Unlocks Rescue Mission mode once you've summited Grouse.
🏔️
Kilimanjaro
Intermediate+
Long sustained efforts with less tolerance. Mental discipline matters here.
🏔️
K2
Advanced
Fast zone transitions and tight bands. Eight seconds of warning before the ground shifts.
🏔️
Everest
Expert
Five-bpm target band. Five-second warnings. All programs available. Leaderboard eligible.
Storm Shelter · calm mode
Workouts aren't the only mountain.
Storm Shelter runs in reverse. Start at whatever elevated HR you have — post-run, post-stress — and guide it progressively down. Zones shrink over time. The game becomes a breathing exercise.
- 5, 10, or 15-minute sessions
- Zone script generated from your current HR at start
- Great for post-workout cooldown, pre-sleep, or anxiety management
- Earns the Calm Descent badge
⛈️
Storm Shelter
Start high. Work your way down. Leave calmer than you arrived.
iPhone companion
The full picture, in your pocket.
Every climb syncs automatically to your iPhone via iCloud. History, achievements, lifetime stats, and high-resolution Summit Cards for sharing — all in a four-tab app that knows everything you've climbed.
- Full climb history with searchable details
- 12-badge achievement grid with progress toward unearned badges
- Lifetime stats: total elevation, best % in zone, streak calendar
- One-tap Instagram Stories export at 1080×1920
📱
iPhone App
Screenshots coming soon.
Real science under the mountain.
Every interval program in Cardio Command is based on published research — Norwegian 4×4 for VO2 max, Tabata for anaerobic capacity, Zone 2 for mitochondrial density. The game wraps the protocol; the protocol does the work.