Shins (vertical) should be 1inch away from the bar. If you bend your kness, then this wont be right. Rips rules say, grip the bar without dropping the hips. Bending the kness would be dropping the hips.
As for chest up, get into position, and when you squeeze your chest the bar should nearly come off the floor (taking away the slack) without anything else moving. I do this on my warmups as with light weight I can set my groove for the whole workout.
The weakness is because he has never previously learned correct form. He has not been using his ES properly in the deadlift, therefore it isn't getting stronger.
Lifting with correct form is precisely how he should address the weakness causing the issue.
Why psoas? There's no (resisted) hip flexion in a deadlift.I am actually starting to wonder if its a ab or psoas weakness
It makes a difference.
The last video looks better. But hips are still dropping too low to start.
Lift the chest up HARD.
Lets be carefull not to mix cause and effect.....Incorrect form is often the result of a weakness, not the cause....without splitting hairs on tiny details, the guys form is already as close to good as your going to get.....if it wasn't for his inability to maintain a straight back (and I am guessing he's trying very hard to do that)......I would argue that he is definately using his erectors (if he wasnt using them, his lower spine would not be rigid, and even 120kg would not be leaving the floor....You can also see him actively contract his erectors in his set up), however I would suspect that other muscles in the force couples which help maintain a rigid spine are weak....remember, its not just erectors that help you keep a locked back....which leads us to the psoas question.....
Why Psoas? Becasue resisted hip flexion is not all the psoas is important for...in fact its very important for force transfer and spinal stability. Think of its attachments, and what a contracted psoas does to your spine...it will pull you through, from the inside of your spine....it's actually quite important, along with all the other muscles (erectors etc) in a deadlift, to help stabilise your spine...you will notice olympic lifters do endless hanging leg raises on those old fashioned gymnastic wall ladders. The psoas is a stabilizer for all the force couples (abs, hamstrings, glutes etc) trying to pull your pelvis the other way
I'll copy and paste here from a Mike Robertson article:
"...The anterior force couple consists of the hip flexors (psoas, iliacus, rectus femoris, and TFL), and the spinal erectors. From the front, the hip flexors pull the pelvis down into anterior tilt. On the back side, the spinal erectors are pulling up on the back side of the pelvis to produce anterior tilt as well.
In essence, these muscle groups are working synergistically (from the front and back of the body) to produce one movement — anterior pelvic tilt. "...
Also from this paper http://www.athletesacceleration.com/...s/EvanOsar.pdf ( i know this is with regards to sprinting, but it addresses spinal stability)
"...Acting as a dynamic stabilizer of the hip, the psoas is important in maintaining
proper joint integrity of the hip during functional movements. It functions to maintain the
lordotic curve in the lumbar spine and assists in creating a neutral alignment of the pelvis....."
Hey in the end I could be wrong.....its a best guess. Generally however, I think that tiny details in set up are largely irrelevant when theres a glaring weak link.
Last edited by zzt; 09-11-2011 at 07:47 AM.