Under Armour Says MyFitnessPal App Users Were Affected by Data Breach On Thursday, the athletic apparel company confirmed over 150 million MyFitnessPal app users were affected. Under Armour The company is currently working with data security firms to investigate the suspicious activity. Affected information included usernames, hashed passwords and email addresses. Under Armour does not collect government information like driver's license numbers or social security numbers. According to CNBC, its shares have dropped 3.8 percent, before paring losses.