All Hart Barbell

Squat Fundamentals #1 - The Set Up
Hand Position - Grip will be determined largely on shoulder width. Generally, griping the bar tightly and with the narrowest possible grip is optimal. This will allow the traps, rhomboids, and rear delts to form a shelf for the bar to rest.
Bar Placement - A coach may help you determine what bar placement is best for you and your leverages. A high bar or low bar position can vary depending on the lifter.
Breathing - Once under the bar, take a big breath to fill your belly with air. Intra-abdominal pressure is critical in keeping the spine safe under load.
Lift Off - Set up ensuring both feet are directly under the bar. This will avoid any lower back extension during the un-rack. Take a deep breath and drive the feet into the ground, stand up, and let the bar settle.

When you see them loading up a the bar for a big PR attempt
📷: .louie