Whilst this is slightly off topic, I train whilst watching DVDs (whatever takes my fancy so action films or Lord of the Rings, normally films I’ve seen before so it doesn’t spoil anything if I miss a few minutes with my head down).
I have considered watching some of favourites in another language and seeing how much I understood. Not sure lightsabers and Death star translate that well though 
Maybe give that a go and see how the concentration copes with that?