BoxedFenders [any, comrade/them]

All of those are way more rewarding than scrolling on a phone, but most of them actually have a higher carbon footprint. Not that life should be lived purely on that metric, but the ad aims to guilt people for their screen usage. Reminds me of a discussion I read around this chart:

Modern batteries are so efficient that an e-bike has less carbon footprint than traditional cycling- which in itself is much more efficient than walking.

As far as activities you can do in your leisure time go, browsing through your phone probably has less environmental impact than anything other than napping. Even say, reading a (physical) book is usually going to require you to go to a bookstore or library (or worse, have it delivered) which will have carbon expenditure.