Really like the video and your form. Is there any value in filling the lungs somewhat to support the abdominal wall for heavier reps?
What you want to do right before you lift is take in a deep inhale using the diaphragm. Inhaling into the chest promotes a rib cage flare and an extended lumbar spine. Expanding the diaphragm will increase the intra-abdominal pressure, therefore increasing spinal stability.
This takes practice to master so I recommend doing what I have my athletes do which is practice reps for breathing. We do this before workouts during mobility drills and after workouts when we are recovering. An example would be instead of holding a stretch for 30 seconds, hold the stretch for 5 deep breaths using the diaphragm.
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