There was a time I could Hula-hoop like you couldn't belive, years of sit-ups and leg lunges made me strong and sleek, I'm in a chair now, but sit up, transfer my selfamnd have good core strength, I think that chair would throw anyone, if core muscles are weak you better hold on. There are better core exercises out there I think. We have a member who owns a gym, bet she knows. Who in a chair can recommend anything about exercising? Or not in a chair.