Your posture is the foundation for every movement your body makes.
What does good posture look like?
When you are standing up, you should be able to draw a straight line from a point just in front of your shoulders, to behind your hip, to the front of your knee, to a few inches in front of your ankle. This will keep your center of gravity directly over your base of support.
If you’re sitting, your neck should be vertical, not tilted forward. Your shoulders should be relaxed with your arms close to your trunk. Your knees should be at a right angle with your feet flat on the floor.