I took my son (just turned 5) to his first swimming lesson. He was booked into the most beginner lesson. They said because he is 5 then he has to swim in water just out his depth. This is purely because they say he is too old to go into the "fun" younger group where he can stand and do games and get confident. He looks terrified and bored and is armbanded up yo death. Is this the right approach?