Image copyright Getty Images Image caption Under Armour sponsors tennis player Andy Murray 
 
 The personal details of around 150 million users of a popular nutrition app were accessed in a breach. 
 
 US fitness brand Under Armour, which owns the MyFitnessPal software, said usernames, email addresses and passwords were potentially stolen. 
 
 However the company said the passwords were protected by strong encryption. 
 
 The breach occurred in late February, but was only discovered on 25 March. 
 
 "The company quickly took steps to determine the nature and scope of the issue and to alert the MyFitnessPal community of the incident,” Under Armour said. 
 
 MyFitnessPal is an app that helps people track diet and exercise routines. 
 
 'Just another day on the internet' 
 
 Leading security researcher Troy Hunt told the BBC the company appeared to handle the breach well. 
 
 “In many ways, this is just another day on the internet: a large online asset suffers a data breach and millions of usernames and passwords get leaked,” he said. 
 
 "To its credit, Under Armour appears to have made an announcement on this within four days, and its method of password storage is quite robust.” 
 
 Image caption Under Armour has emailed MyFitnessPal users to alert them to the problem 
 
 Mr Hunt said this was a “vast improvement” compared to high profile data breaches suffered by the likes of Equifax and Uber in the past year. 
 
 Under Armour said it had been sending messages to users directly if they had been affected by the breach. 
 
 "The notice contains recommendations for MyFitnessPal users regarding account security steps they can take to help protect their information,” the firm said. 
 
 "The company will be requiring MyFitnessPal users to change their passwords and is urging users to do so immediately.” 

 Shares of Under Armour dropped 3.8 percent, before paring losses, after the active-wear company informed users of its online fitness and nutrition website their data had been compromised. 
 
 Under Armour announced on Thursday that the breach affected an estimated 150 million users of its food and nutrition application, MyFitnessPal. 
 
 The investigation indicates that affected information may include usernames, email addresses, and hashed passwords. 
 
 Payment information, which Under Armour collects and processes separately, has not been affected by the breach. Under Armour does not collect government identifiers, like social security numbers and driver's license numbers. 
 
 Under Armour first became aware of a potential breach on March 25, when company discovered an unauthorized party had accessed MyFitnessPal user data in February. Under Armour took steps to notify affected users, and is now is working with data security firms and law enforcement to assist in its investigation. 
 
 This story is developing, please check back for more information.
– In what may be the worst thing to happen to Under Armour since everyone was making fun of Steph Curry's shoes, the athletic gear company revealed Thursday that a data breach of its fitness and nutrition app compromised the data of 150 million or so user, CNBC reports. The breach of the MyFitnessPal app occurred in February but wasn't discovered by Under Armour until March 25. "The company quickly took steps to determine the nature and scope of the issue and to alert the MyFitnessPal community of the incident,” the BBC quotes Under Armour as saying. The company says affected information could include usernames, email addresses, and passwords, which are strongly encrypted. The company says no payment information was impacted. Under Armour shares dropped 3.8% with the news.