Do any of you guys violently jerk the bar off the ground when you deadlift? I see this all the time and even in competitions. Seems like a great way to cause an injury. I always just apply gradual pressure until the bar comes off the floor. That grab the bar and jerk is just insanity.
Exploding as fast as possible with the weight is ideal ofc. But it does not mean jerking.
Your entire body should be tense before you even touch the bar. Triceps should be tensed to ensure your arms are straight, breath sucked into your abdomen to brace the lumbar spine, back arched, legs slightly bent with hamstrings and glutes tensed.
Once you grip the bar, grip it like your want to tear it into two pieces, pull the slack out of the bar. Look slightly upwards as this will assist with improving the speed of the isotonic muscular contraction.
The faster the lift the better, as it decreases the time under which the lumbar spine is under pressure. Even with an arched back there is pressure on the lumber spine.
It's taken me a while but after perfecting this technique I can deadlift heavy multiple times a week.