One of the biggest reasons to do loaded carries is to strengthen the core while standing in an upright posture. The core is essentially all of the muscles that work together to support the spine and the pelvis. Having a strong core means that you can maintain a rigid torso and restrict movement at the spine. This allows you to effectively transfer power from the legs and hips into the bar when squatting, into the shoulders and arms when throwing, or to produce the maximal force during almost any athletic activity.
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