Is This a Fad or a Barefoot Running Thing?

By 2010, the barefoot running industry is accelerating and by 2011, 12, there are barefoot shoes because you can't sell nothing. So these shoe companies are like, right, how are we going to sell nothing? We'll make barefoot shoes. And so because if you didn't adapt, the shock would be sent through your skeleton if you landed on the heel without the cushioning of a shoe,. You'd have this ground reaction force up through your skeleton. It's a lot, and so Lieberman speaks about impact transients. Now I've subsequently met a lot of biomechanists who have massively questioned the validity of that. What's the importance of this impact transients or