alt Hacker NewsAct of recording is right. Pen and paper is efficient and you get a safe way to archive it once you fill the book up, it can go into storage or the bin. It's fool proof, doesn't have bugs or network timeouts, costs nothing and will give all the benefits of journaling without the downsides of digital distractions. I hate how every tech enthusiast thinks their addiction to technology is of benefit to humanity at large.
I used to log my weight lifting in an app but I found it really distracting and time consuming so I gave up. For the last few weeks I have been bringing a small notebook and doing my logging by pen and paper instead. I find it much more relaxing and I only use it to check what weights I used last time, so I don't really miss anything.
Pen and paper is severely underrated today.