Running shoes can alter a young athlete's gait, and not in a good way: study

The latest study to weigh barefoot running against traditional running shoes finds that mixing up the footwear -- training in cushioned shoes, competing in track flats -- may confuse the running gait in young athletes.

While running seems a fairly straightforward activity, ask a devotee his or her opinion about foot strike -- is it better to land on your forefoot (as barefoot running shoes promote) or heel? -- and you're likely to stir up some hot debate.