An investigation by Le Monde reveals that U.S. Secret Service agents using the Strava fitness app have inadvertently revealed sensitive locations of leaders, including Biden and Trump, thus raising security concerns. Despite the U.S. Secret Service's claims of no significant breach, experts emphasize the need for stricter regulations on data privacy and highlight inherent risks in using fitness applications. The app, which is widely used for tracking physical activities, poses threats including potential stalking and malicious targeting due to the public disclosure of users' movements.