Answer:
Stand with your feet about hip-width apart with a slight bend in your knees. Extend your hands in front of you or place them on your thighs. Lengthen your neck, bring your chin toward your chest, and round your spine. Then look up, lift your chest, and move your spine in the opposite direction.
More Tips:
Sitting correctly. Make sure you're not leaning forward.
Stand tall. You might not pay much attention to how you stand, but it can make a big difference to your posture.
Exercises: Plank, bridges, chest stretches, etc.
