Had problem at first understanding what Romanov was talking about. Read the book Born To Run and investigated Evolution running by Mierke. Mierke was easier to understand and his video was the best I've seen. About a month ago went back to looking at Pose, it made more sense to me and I was able to graspe what Romanov was talking about. Where Evolution running was pushing the use of the larger muscle groups hips an quads, Pose was using the hams. I was having trouble with heel flick with Evolution running and the foot drag concept. Could get the heel flick better with Pose with the use of the hams lifting ankle to butt. I have combined some of the concepts of both. I use Evolution running concept for hill running , but use the Pose concept of using the hams. I prescribe to the barefoot concept , wearing shoes (Newtons). Use the concept of foot strike on ball of foot under the hips with slight lean from the ankle. Elastic recoil , the use of Plantar and arch i prescribe to. After having Plantar fascilitis , I will never go back to cushioned shoes. If it wasn't for this style of running , I wouldn't be able to climb the stairs having compound fracture of the leg 2 years ago. I also would not be able to run without the leg placement under the hips . You tube has been an excellent aide in learning Pose. No problem with knees or joints because the stress and impact is not transmitted from ball of the foot.