Dan John has talked a lot about Goblet Squats and their value in patterning the squat.
I found this video of a strong set.
Deep, straight back. (but crap shoes as Pieter points out in the comment below)
EDIT - For what it is worth the video below is what Dan John himself in his new book (Dan has just posted a link to a free ebook - The Coyote Point Kettlebell Club) points to to explain the move. You will see it is more of a mobility move / stretch.
I found this video of a strong set.
Deep, straight back. (but crap shoes as Pieter points out in the comment below)
EDIT - For what it is worth the video below is what Dan John himself in his new book (Dan has just posted a link to a free ebook - The Coyote Point Kettlebell Club) points to to explain the move. You will see it is more of a mobility move / stretch.
Comments
Dan John discusses it here it is all about squatting between your legs.
Should he have really pushed so far into exhaustion though? Isn't there a bigger risk of losing form and causing injury? It looked like his left knee was about to collapse on him at the end.
Cynthia
I would prefer clients limit their squat depth until they get their ankle mobility to an adequate level or they will compensate somewhere (lumbar flexion, femoral internal rotation, and valgus genu). Additionally, I would like to see more stability at the bottom ROM. I like to use pause sets in beginners to help them develop stability at the bottom ROM.
Lastly, I prefer using a kettlebell (or two) or a barbell to help develop torso stability. I coach them to "stay tall" and "keep the upper arm horizontal" through the entire range of motion. This is very challenging and most people lose the "tall torso" after a few reps. This guy seemed to lose it, too.
I'm not sure how an exercise that increases the lever arm against which your low back muscles (which have a short lever arm) have to work is protective for the low back? Even with less weight, the longer lever arm makes this exercise a potential problem (or at least as problematic as a back squat, depending on the weight and it's position). Would you have anyone with low back trouble do it? I wouldn't.
I think the goblet squat is much more about patterning a squat movement rather than moving big weights.
I think this guys shoes and elevated heels are not ideal.
As for the low back - the more vertical the back the less the moment arm surely? It is when the back hinges at the bottom that you get a lever.