Has anyone had experience with Feet Up/headstand inversion table? I am interested in buying one. I am in good shape, flexible and practice yoga, but have a concern and wonder what would happen in you fell sideways. Seems like you would break your neck with your head locked in to the bench! I sent a message to Feet Up consultant on fb messenger. Reply was that it's impossible to fall sideways and it wasn't totally safe. Any thoughts or ideas?