i've been doing boxing for some years but recently got a shoulder injury that will take many months to recover. Unfortunately i cannot do sparring and other heavy training and can only do light exercises and practice combinations that are not too taxing on the shoulders. What types of training can i do to keep up in the meantime so i do not lose progress or at least have something where i can improve?. I was thinking on focusing on footwork, coordination drills and light shadowboxing for technique but i can't seem to incorporate them well enough.