Okay, ill separate the steps
You don't have a clear setup distinct from your back squeeze and your are dropping your hips as you squeeze your back, so it's hard to tell. Your setup is close, but you need to separate the steps. Also look further ahead on the ground and keep your gaze there. Don't pull up with your head when your squeeze. It's just your chest that needs to go up to flatten your back.
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Okay, ill separate the steps
First rep is what you want. Later reps your hips are dropping as you squeeze which throws your positioning off.
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Science for Fitness:
Online Strength Coaching, Nutrition Coaching, & In-Person Training