Time Series Data Export The Time Series export provides a detailed timeline of your tracked activity. Files Included: ---------- cardio_load_YYYY-MM-DD.csv - Where YYYY-MM-DD is the starting date for the entries in the file. Cardio load also known as cardio exertion. Indicates the load on the cardiovascular system. Each entry has the following values: timestamp - Date and time at which the entry was logged. workout - Cardio load accrued during workouts. background - Cardio load accrued outside of workouts. total - Total cardio load, sum of workout and background cardio load. data source - The origin or source of this data.