Having passed my B.A.W.L.A(British amateur weightlifting association)teachers certificate I can say that the correct way to teach a exercise is
1,silent demonstration
2,talk through demonstration
3,description of movement,muscles used,start position,breathing rhythm and queries from the students.
Absolutely no weight at all should be added to the bar until the instructor is 100% confident in the students grasp of the exercise and form is bang on.
4,correct mistakes in form,coach and encourage.
Anything less than this being taught by somebody in a responsible (supposedly qualified)position should of been told really politely to leave the gym immediately.
It sound's like a accident waiting to happen kitty???and exactly why instructors are taught to teach groups correctly before being given a certificate to teach.
<message edited by Nigalwayne on 10 February 2012 22:42>