In short, it refers to getting better leverage and “connectivity” before you initiate the pull.
Many lifters yank the bar off the ground, which in turn makes me cringe because I’m always afraid someone’s going to rip their bicep tendon off the bone. Moreover, the yanking action elicits a loud “clank” noise (barbell hitting inside of plates).
Getting the slack out of the bar means using the barbell as a counterbalance to 1) gain leverage, and 2) get everything connected – inner cylinder of the plates “connecting” with the barbell – BEFORE you initiate the lift.
I like to tell my clients/athletes to get two clicks: bend the bar (get the slack out), then pull.
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