Predicting Your Stress Before It Happens: Building an LSTM HRV Predictor with Apple HealthKit and CoreML

Have you ever felt completely drained by 3 PM, wondering where your energy went? Most wearable technology tells us how we felt in the past, but the real holy grail of health tech is predictive biofeedback . By analyzing Heart Rate Variability (HRV) trends using LSTM neural networks , we can move from reactive monitoring to proactive stress management. In this tutorial, we will explore how to take raw time-series data from Apple HealthKit , process it with Pandas , and build a Long Short-Term Mem