Does Rory's Magnet Bracelet.....

[Stewie007]

Power bracelets used a nice little technique to fool people in their infomercials.

Most people do not have great core coordination. The idea is that you get someone to "stand up straight" in what they think is proper posture. Then you push down on their shoulders. Most people fall back because they aren't leaning forward enough. Others are leaning in a neutral position with the back supporting but the leg holding the weight. If you are unused to this position, it will give you an illusion that you are leaning forward.

When properly supported no one can push straight down on your shoulders and make you fall. Your legs resist the motion. However, when you're in incorrect posture, your back tries to resist and it cannot; those muscles are not anywhere as near strong enough.

The advertisement has an actor first stand in incorrect posture. They push, and bam... predictable results. Then, they are corrected for the next part. The bracelet is placed on their wrists, then the person pushes down again, but this time the actor is in the correct neutral standing position. No amount of force will move them. Its just like COG exercises where you must resist a pushing opponent without falling back. Many people resist with their back muscles instead of their leg muscles and a tiny person could move them. But in proper position, and correct muscle use, again... the person can resist the oncoming force.

They aren't pushing them differently. They are merely instructing them to utilize proper neutral posture when the bracelet is on.