What are your favorite ways to track long term challenges like 2021 miles, pullups, etc. in a year? Paper, spreadsheet, app, other?

Doing a mix here…

I use habit tracker app for things like "do x (at least) y times a week", and also have a spread in my bullet journal for the full year, marking days I went running, climbing, training with colored dots.

Running I track with an another app, as I do biking.

Other challenges I note down in my journal or on the tally sheet (online & hardcopy as a backup).

Coros is amazing for recording this stuff.

Honestly, I use the dht sheet. But I wouldn't be tracking my workouts if it wasn't for the challenge. I also just signed strava which integrates with my Coros watch. The watch is GREAT for tracking and has its own software. At the end of the year you get a report from the year with your stats (I'm guessing you can get them anytime).