Learning Guitar Theory Without a Guitar

[Robguitaruk]

hi guys

I work in a job where I have a lot of time where I listen to podcasts, music, etc. I then realised why don't I use this time to learn and consolidate guitar theory. obviously learning is more easy or useful when one can put those learnings into practice with a guitar in hand.

I won't have a guitar in hand while I'm as t work obviously, but so you guys know any great ways to learn about guitar theory whilst only listening? maybe there are audio programs out there that have exercises that one can do in their minds to learn and consolidate learnings?

any ideas are welcome. I'd love to use the hours I have available wisely.

thanks