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It's actually a waist belt and not a hip belt. If you put all the weight on the hips you'll get very tiered legs, especially when walking up hills.
I think this is one of these retarded things that just become common practice and it continues with no reflection of its correctness.
>Some studies confirmed that wearing a belt during weightlifting increased intra-abdominal pressure by up to 40 percent, while one study reported that compression of the intervertebral discs was reduced by 50 percent. Increasing intra-abdominal pressure is similar to inflating a balloon inside your abdominal cavity. The pressure inside the abdominal cavity pushes on the spine to support it from the inside, while the core muscles in the abdominal wall and lower back push on the spine from the outside. This inside and outside pressure acts to stabilize the spine and reduce the stress it receives when lifting heavy weights. This is how lifting belts can help to protect against back injuries during lifting. It's not due to the belt supplying the support, it's due to the way that the body reacts to the belt that supplies the spinal support.
