Flexibility has little to do with height and thinness. If you want to increase flexibility, you can start by stretching the muscle fascia. Not difficult, the method is more important. In addition, everyone's situation is different and needs to be considered. Basically, pulling the muscle fascia apart will definitely improve flexibility. Many people have poor flexibility only because the muscle fascia has become shorter. In addition, be careful not to stretch. It's not good if you strain the ligament.