Just as you would work out to keep your body in shape, so does your vocalis muscle need to work out - and not always just the warm ups you are doing for that weekly choral ensemble or cramming for a performance. You can’t lift heavy weights without building up to it. Your voice needs to be treated the same way. Consider a daily regimen that gradually brings those folds together and then stretches them up and down the range and through multiple vowel shapes and phrase lengths. Even if you don’t have time for repertoire, put your voice through the paces of onset, resonance balancing, agility, sustaining, and voce di testa. Richard Miller has some of the best!