Please read Mark's email below. I have observed a similar picture over the past few weeks at the pool.
Starting with today's swim lessons, I will insist on the following:
The focus of both the junior and senior sessions must be on improving the children's swimming techniques. Some students may be beginners, some may be more experienced swimmers. As mentioned to you earlier this week, each student must feel challenged and should leave every session as a better swimmer. This is a paid activity and so there cannot be any free time.
Please let me know if you have any questions.