This repository contains a Jupyter notebook that processes Strava data exports to generate interactive running heatmaps. The core functionality involves parsing GPS and sensor data from .fit.gz files, filtering activities by type and date, detecting a home location, rasterizing GPS tracks into multiple value grids (frequency, pace, heart rate, gradient, elevation change), applying Gaussian blurring and normalization, and rendering the results as overlay layers on a Leaflet basemap via Folium. The output is a single HTML file with six toggleable layers showing different aspects of running patterns. The code demonstrates solid data processing techniques including efficient caching, coordinate transformations, and custom visualization logic, though it remains tightly coupled as a monolithic notebook.