mattj's right. tendon and ligament damage will ensure from this.
also the weights and sets are a bit high, 6 sets of 20 squats on 50 kilos is going to screw them over if they dont know how to lift that properly.
Not a great routine mate, too much work, not enough rest, and its a bit scrambled too in the order of the exercises.
plus the factor you have to remember is that relatively few people can actually perform the correct exercises, so I hope you can show them.
Ill just wait for cord to make one since i suck lol