What are some good excercises for a better posturee?

I have always had a good posture but due to some changes in life I use my body differently at many tines a day and I belive this will change my posture if I do not do regular excersice (my lower back feels tired nowdays)

What advices do you have?

I don’t know about posture but when I hurt my back a little while ago I found yoga and Pilates both very helpful.