Paul English, co-founder of Kayak, has launched a new iOS app called Steppin, designed to reduce social media usage by linking it to physical activity. Users must complete daily step goals to unlock access to platforms like TikTok and Instagram. The idea, conceived during a family vacation in Spain, aims to enhance both physical and mental health. The app is free at launch, with plans for a subscription model in the future. Steppin will also allow logging other activities like yoga to earn screen time, promoting a healthier lifestyle for all ages.