From browsing social media to watching videos and chatting with friends, Indonesian university student Tyas Sisianindita spends about eight hours a day on her phone.    

Nettox, a wristband device invented by Indonesian students to alert people about the time they spent being sedentary, is pictured on a table during a test at a university in Depok near Jakarta, Indonesia, October 16, 2019. REUTERS/Willy Kurniawan