"Energy return" and "helping to propel you forward"... so sounds like Newtons then? Maybe better for heel strikers, or fad-seekers!
Does make me wonder: if they really made running much, much easier should they be allowed? After all you could put wheels on your shoes and set some good times too (though not uphill!)
Not saying they're not legit, but I guess they are some rules on shoes that can be worn, and if this started an arms race for manufacturers would those rules have to be tightened up maybe? If I'm beaten by someone in a race, I'd like to believe it's because they're a better runner, not just because they can afford a super high-tech pair of shoes!
Just a thought. If they only give a marginal gain at best then no issue.
