Legs alone. Squatting properly means your whole body was involved. Especially if you develop all squat styles. Legs can have their own day. The rest of your body you can rest, but you will still have to walk all week while you recover. Etcetcetc
Hit shoulders with chest. Focus on overhead press with perfect posture. You won't need any extra triceps work. For chest concentrate on dips and incline as a bench substitute.
Back and biceps are classic and the only thing I could even suggest is a 4 day split where you hit arms and calves on their own day to take off the big muscle groups. I also feel forearms, calves, and core can be hit almost every day within reason. Especially if your trying to push up your big big lifts. I circuit my legs and back every day and do heavy 3 days a week at the moment with a lot of mild to moderate cardio . A lot of that is furniture moving so YMMV.
The system I'm talking about is more for health and not focusing on gaining the most muscle or anything. Just not losing any while cutting. It's also postural related to help my back.
I stretch before bed too, Yoga is your best bet IMHO.