Types of Deadlifts
There are types of Conventional Deadlifts with slight variations.
1) Olympic Style Conventional Deadlifts
With this method, "Pushing the floor away", Leg Pressing the weight off the floor occurs.
Olympic Lifter employ this method because it correctly postiion the Bar for the Second Pulll
This method place more of the work load on the leg vs the back.
2) Powerlifting Conventional Deadlift
With this method, the muscle firing sequence is Back-Legs-Back.
The Back initiates breaking the weight off the floor, with some assistance from the Legs.
As the bar ascends, the Legs play greater role with the assistance of the Back.
Once the Bar is abve the knees, great Back involvement occurs.
Research Dr Tom McLauglin, PhD Exercise Biomechanics; multiple post on this.
Trainining Objective
Both are effective method.,
The Training Objective determine which technique is used.
Your lumbar is rounded at the bottom
Lumbar Rounding
Lumbar Rounding should be somewhat limited.
Grahamgolfer rounding is minimal and acceptable.
Some of it is Thoracic Rounding which is fine. Thoricic Rounding enables Deadlifter to decrease torque in the Movement by maintaining the Bar closer to the Body's Center of Gravity.
Dragging The Bar Up
Research Dr Bret Contreras and others; multiple post on this.
The Bar is slightly out in front of Grahamgolfer's Deadlift which increases the torque, magnifying the Bar Weight beyond it true load.
The key to minimizing torque is to pull the bar back on top, drag it up the shins and thighs.
Doing so, ensure that it is as close to the Body's Center of Gravity as it can be.