The app does not maintain a persistent connection with the treadmill. So, if the iPhone screen locks, the app switched back to disconnected. Any time and steps are not recorded. Reopen the phone, there’s the app waiting to be reconnected again. The step count does not sync to Apple health reliably, only sending over the first dozen steps or so. I did 6,000 steps the other day and Apple health only got 213 steps from Unsit. I have moved Unsit to the top of sources, even above Apple Watch data, and it is still not correct. The app needs work to be a useful tracker with the treadmill. It feels like an early beta still.