I was glad to see your question. That is a problem in my family. One member couldn't ride Test Track. I look forward to the replies.
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It has all of the usual warnings posted.
You do get some air time on the hills, and when you come down you'll feel some positive G's. I imagine if you can't take compressions on your spine then you would not want to ride.
It is overall a pretty smooth ride though. way easier on your back than Indy.
I hope you can experience the fun.
My experience is it just isn't too different than riding in a car. Some starts and stops, but no real G-forces. I have a heart issue, but RSR is no trouble for me.
As always, err on the side of caution, if in doubt. It's a great ride, but still just a ride. Maybe ask your doctor about it.
This is always a concern for me when they build a new attraction. Lately I see them focusing on thrill rides for the new "E-tickets", and it makes me sad when I think that I won't be able to experience some of these. Fortunately, RSR isn't too fast for me. Hopefully it won't be too fast for most people.