1) I wonder how it works. Is it possible that we have X capacity for attention and if we want to engage only X/2 capacity, we find it difficult? so if we engage X/2 (in meeting) and X/2 in crocheting, that engages X and so we function better?

2) Maybe unrelated not sure but I was reading about voice training in acting. One of the ways to free voice, it being busy in some kind of movement that takes up part of your attention.