It may seem like that, but each country has a different style of exercise and different posture, so I uploaded a video because I wanted to hear advice from people from various countries.
Thank you for your advice. I think the reason is that she is still a young girl and has no strength in her legs. I will also pay attention to her knees.
Thank you for your good advice. The child is still young and she's not putting in various serves to see if the attack is comfortable after a long serve. I'll practice a lot of attacks after a short serve