This interactive visualization parses uploaded FIT files and displays the extracted fitness data. Built with React, it uses the fit-parser library to decode binary FIT file structures, including message definitions, record fields, and timestamp offsets. The parser handles various data types like date_time, uint16, strings, and byte arrays, converting them into readable values. The interface provides a simple file input for users to load and process their fitness tracking data, though the current implementation focuses on the parsing pipeline rather than visual output.