Thanks for that. I wonder if maybe you don't need to get to old age to get a real understanding of what a predator gravity can be. I took a fall last February and either broke or badly bruised a rib and it was excruciating for a few days and then just fairly painful for a couple more weeks. You probably remember Don McGregor from the '72 Olympic Marathon etc. He died from a fall a few years back. And breaking a hip when you fall when you're old is what often begins the tolling of your funeral bell. I cannot think of any kind of upside to having an 80 year old woman who already has at least a bit of a mobility issue wearing super shoes.