DS1 is in year 7 and has come home today explaining that their PE lesson today was spent in the fitness centre.
1 teacher for 25ish pupils and they were allowed to use various gym equipment working in pairs including:
Leg extension machine
Dumbells
Cross trainer
Exercise bikes
Treadmills
Chest press
Shoulder press
They were told not to lift over 15kg. Apparently there was lots of bravado and showing off in the class about who could lift the most etc.
They had no training or coaching on how to use the various pieces of equipment which meant that boys were swinging rather than lifting the dumbells.
DH (a sports coach) is furious and says that 11/12yo is too young to be doing weights and that they can do permanent physical damage doing this. I do know that when joining a gym you have to have an induction so why should it be different at school.
To make things even worse DH has warned DS1 that he is likely to be very sore over the next couple of days due to using muscles he does not usually work - terrible timing, of all the eekends this could be.... DS2 wants to be a professional dancer and has exams on Sunday 
Would you/is it normal for year 7a to use this equipment without tranining? Is DH correct that it could do long term damage? Not sure how to approach this with the school.
Apologies for the long post but don't want to drip feed.