Right I think it's time for a few videos. I will post up a squat video with analysis tomorrow, but unfortunately the squat isn't recent, it's the only video I have of good form
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First, here are some deadlifts at various weights which provide a nice comparison:
So to analyse these lets start at the top of the rep since that is where I perform my set up. The first thing I do is position myself with a neutral spine which involves looking forward and making the back of my neck as long as possible and removing any flexion from my hips by tensing my glutes.
Then I will brace my core by breathing in and holding to put pressure against my abdominals and the erectors in my back (
Important How To Video).
Then without losing any tension in my core I descend to the bar with straight legs to allow maximal tension on the hamstring which allows me to recruit them to generate more force. I am able to reach the bar without bending my legs a great deal as my hamstring flexibility is at a healthy range.
NOTE in the videos I bypass this step slightly as I have been doing it for a very long time and the motor pattern has become second nature to me, so I find it unnecessary to follow all of the steps.
Next I adjust the height of my hips by bending my knees so that my shoulders are directly over the bar.
Then I make sure the bar is resting on my shins and I initiate the drive upwards, with the pressure going through my heels. The bar doesn't leave my legs until after it has moved past my knees.
Once the bar is above my knees I can "lock out" the lift by engaging my glutes in a thrusting motion that is best described as "humping the bar". Also note that the rep finishes with me standing directly upright in pretty much the position that I started with the bar pulled into my thighs.
Throughout the movement my spine stays in the neutral position it started in. As has been mentioned several times the worst thing you can do to your back is bend it when it is under load.
Please feel free to add your own critique, as that is the whole point of this thread
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Edit: Perfect timing there bro!
Edit no.2: Forgot to add that of course my back stays straight in the lift so I added it in
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