The conversation between human and AI assistant.
Can a person increase his/her height even after 20?
Yes, please. What are some tips to improve posture?
Some tips to improve posture include: 
1. sitting and standing up straight 
2. keeping the shoulders relaxed and perpendicular to the ground 
3. keeping the chin parallel to the ground 
4. stretching regularly to increase flexibility 
Do you have any other questions about improving posture or increasing height?