An arched back positions your body in a way that can give you more power, more stability, make the lift feel a bit easier, and allow you to lift more weight. An arched back is necessary to use leg drive, which recruits your lower body into the lift.
If you are lifting an amount of weight that is far below your ability, you won’t notice any difference at all if your back is arched or not. If you are lifting weight that is heavy enough where you can only do 1-3 reps, it will make a huge difference.
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