Dead hangs with zero friction. Your watch detects the hang itself: mount the bar and the count begins; drop down and it pauses automatically. Nothing to learn, nothing to tap — even with numb hands at the end of a set, you never touch a button.
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The simpler a tool is, the more you use it — and the more you use it, the longer you stick with it. Everything in HangSpine is designed around one idea: keep your attention on training, not on the app.
The start screen shows today's progress and a single Start button. The last 3 seconds before a set shouldn't be spent hunting for features — tap Start, and after a 3-2-1 countdown you're on the bar.
The watch's gyroscope senses your wrist posture continuously: raise your arm overhead into a hang and the countdown starts; let go when you're done and the session pauses itself. One natural hang becomes one complete record — while you're hanging, both hands are on the bar. You have no spare fingers for buttons, and you'll never need any.
Hold for 10 seconds (adjustable 10/12/15 s) and it counts as one rep — confirmed by a gentle haptic as the ring fills and flashes green. Hanging is a fight against time, so we cut the long goal into 10-second victories. The psychological cost of one more rep drops to zero.
The summary appears the moment you finish: total reps, total time, and a per-set breakdown. Want another round? "Again" takes you straight back to the countdown. No bloated reports — glance at it, then get on with your day.
The phone app is a single screen: today's goal ring, streak flame, week/month/year trends, and a six-month heatmap. Stats here aren't a dashboard to study — they turn "how long I've kept this up" into one glance of visible progress. For many people, it's the flame they can't bear to extinguish that gets them on the bar every day.
Height, arm length, bar setup — no two people hang the same way, and fixed thresholds can't fit everyone. HangSpine records the full motion trace of every session and keeps learning your personal mount-and-dismount signature, entirely on device. The more you train, the more precise it gets.
Every session's wrist trace — angle, three-axis gravity, grip energy — is captured at 2.5 Hz and kept for review. See exactly what the sensor saw.
Detected it right? Tap the thumbs-up. Misjudged? Thumbs-down. Two buttons, one second — your feedback is the best training data there is.
Detection parameters are re-computed on device at intervals, gradually conforming to your movement pattern. Nothing is ever uploaded for cloud training.
Every hang's trace overlays into a cloud — the darkest paths are the movements you repeat most; the dashed line is the current detection tolerance.
The three gravity components flipping in real time is the grab-the-bar motion itself. Physics doesn't lie.
Under real load, forearm physiological tremor (8–12 Hz) lifts the grip-energy curve — an empty-hand raise can't fake that signal.
Health apps today make you copy a video: whether you did it right, or deep enough, neither the app nor you ever knows. HangSpine is built the opposite way — using the Apple Watch's 3-axis gravity sensing to capture motion as it physically happens and judge, one-to-one, whether it's up to standard. Dead-hang counting is simply the first application of that capability.
Spinal segmentation · Breath sync
Core stability · Flexion control
Cross coordination · Shoulder girdle
Contralateral reach · Lumbar stability
The first preset moves arrive in the next update. The library will keep growing, with support planned for recording your own favorite exercises — Pilates and spine-health routines included.
"The only workout that works is the one you keep doing."
That's why HangSpine refuses complexity from day one: no account, no social feed, no subscription — mount the bar and train, let go and rest.