Kept using 3rd party apps until they shut down. I personally wouldn't be caught dead on the offical reddit app just on principal. I tried using the desktop site a couple times until I found Lemmy!
The major exception to this is if I look up a question or something and theres an answer on Reddit, I'll still click that link.
Do it with a friend! It worked great for me: my friend and I both tend to get distracted easily but working out together helps us keep each other on track and also the workout goes by faster when you have someone to talk to. Also we motivate each other to push ourselves as well!
Find yourself a gym buddy, it might be what you need!