Cellists - First Practice After One-Month Break - Routine & Symptoms

What do you do when you haven't practiced for a month? I'm writing a story and would love cellists' input here. You haven't played in a month; you've got a full day to yourself and you want to get back into it: what does your next cello practice session look like? what's different from a normal practice session (which I don't know how it goes tbh)? how bad are you and at what specifically, what does it sound like? where do you feel strain in your body? how much time do you need to get back to normal? In as many details as you can, physical sensations, technical stuff, what you do exactly, all of it!