Were you experiencing knee pain? It could be possible you were at a level were your tissues were adapted enough to able to accept that additional straing. And

Were you experiencing knee pain? It could be possible you were at a level were your tissues were adapted enough to able to accept that additional straing. And I would stress that works for you probably won't for others - as a few counter examples, Mr Sorokin was wearing shoes with cushions during his run, and other elite runners who grew up running shoe-less, such as Haile Gebreselassie, run with shoes.