Thx for all opinion, I have realized my girl getting progress and building up much more confidence. She is a bit tired but healthy, we may adjust lesson Plan after summer vacation. I believe I won't kill my angel.
As parents, perhaps we need to re-consider what we are aiming to ask a 4-6 years kid to 操水. To swim faster to win in swimming competition for primary school application? To make our kids healthier? To do more exercise? Once we know what we are target for (of course not sure if it will be good to kids), we should know how to do.
Personally thinking, 1.5 hr 操水 & three times a week are pretty tough for a kid below 6.