Xiaomi Mi Band 2 and Mi Fit app, not yet ready for prime time? Unreliable. Bad exercise HR data. Will NOT measure HR over 110 BPM, on a very brisk walk. Sleep monitor, resting HR, step counter have some value. All other functions are too unreliable and erroneous. Pedometer step count can be way off on measured mile walk. Even the clock doesnt keep good time, just a few hours after the last Bluetooth sync, it drifts off by more than a few minutes. BT sync is hit-or-miss. Often takes two or three tries to get a sync to complete. Sync too slow and big waste of time.
Plan to return the device for a full refund if the next update fails to fix problems. Thank you Amazon Prime! Looking elsewhere for an exercise heart rate monitor that I can wear on my wrist for under $50.
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Update! Just discovered the MI HR app which can capture continuous HR from Mi Band. This may solve many problems for EXERCISE heart rates!