No infomercial can give you a 12 hour lower back physiology and biomechanics course. That's why they come with a disclaimer to talk to your doctor first before you start an exercise program.
As for this product, I'm no longer recommending it. ( I'm Deebel by the way). Not because of any OMG you're back will explode, but because a good friend asked me to help him out. you want to know why i'm not endorsing it now, PM me.
If you want a reverse hyper, buy one from Lou (my buddy) or Dave Tate. the product for sale in the infomercial is okay for your average regular Joe to use at home.
To go into every single medical reason why someone shouldn't use a reverse hyper isn't the scope of an infomercial. Again, this is why there is a disclaimer.
In my 20 years of treating people, most can benefit from some light strength training in their posterior chain muscles. Few patients have disc issues so bad, or stenosis that bad that this would hurt them. Done with lighter weights of course.
As for altered movements patterns, your average regular patient is so weak in their day to day lives, that almost any exercise would be good for them.
When you treat people on a day to day basis, you'd be surprised to see how many would find it taxing to walk 1/4 mile. The last thing you need to worry about is movement patterns when they are fat, weak, and have no aerobic fitness.
Funny thing is the few people that have done some simple lower back exercises such as this, simple scapular retraction exercises for shoudler issues, and so on have shown great improvement.
This is simply a home model machine designed for basically a weak person.