Those commercials are presenting them for rehab situations because they can't come on and say that they help you lose weight anymore. These products are a complete crock, to put it bluntly.
You can't build strength and muscle without resistance exercise unless the muscle is completely untrained and atrophied and even then only slightly. These products prey on the misinformed and promise things that they can't possibly deliver. Don't waste your money.
An exercise does not have to be strenuous to be effective. Your friend would be better off in a gym with a trainer showing them proper form on back and core exercises so that they can start to develop some support and stability.



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