Fran, it's really a great exercise and you don't have to go as low as they did (especially the girl in the middle
). I first ran into these at an Alwyn Cosgrove workshop ... he made us all do all eight rounds.
Of course I wasn't nearly as fast or deep as the video! The workshop was called 'Your Body Is A Barbell' and it was all about lower body exercises using only bodyweight. So then he had us do the leg matrix that Mel posted about a while ago - 24 squats, 24 lunges, 24 jump squats, and 24 jump lunges - in 90 seconds. And a whole bunch of other bodyweight exercises. My legs were total Jello at the end of the hour!
Seriously, this really is an exercise that you could do now - I've used it with a number of clients. Just go to parallel on the squats - there's no need to go so deep - and do as many as you can in each 20 second round. I haven't had a client who can do more than four rounds though!
One other thing ... we were taught to do them using Prisoner Squats (hands laced together behind your head):
and I can keep my balance better that way.
C'mon and give 'em a try! Ilene promises that she will too!