The researchers said that over 61 million records were contained in the data repository, including vast swathes of user information -- some of which could be considered sensitive -- such as their names, dates of birth, weight, height, gender, and GPS logs, among other datasets.
While sampling a set of approximately 20,000 records to verify the data, the team found that the majority of data sources were from Fitbit and Apple's HealthKit.
https://www.zdnet.com/article/over-60-m ... -database/