thanks.

Thank you for info. I told her she needs to care about her body and give up early if it's too difficult for her. she is not strong and eat very little every day. I know other three girls older and stronger than her. I told her, she needs to eat more if she likes to hold longer. Maybe she likes me a little, I always try best, but when i am getting older, I feel it's too hard.
It's not good for life. How to teach her to try best but not too hard? I know it's hard to measure which level is the best.