[westiseast]

I agree.

Evidence out there seems to suggest that trainers are bad by overcushioning the feet or placing the body in a bad position, but...

For example, I'm sure our neolithic ancestors ran long distances because they had to. There's nothing implicit in this about whether it's good for us, and we don't know how many of them got eaten or died because they had bum knees!

[marcus_holmes]

our neolithic ancestors also ran on grass/ forest floor, not asphalt or concrete.

I run in cities. I love my trainers.

[TylerH]

Well, it's definitely worse for us because even with an inch of padding, our knees still take a huge amount of force when striking that way, even if we don't notice it per strike. Heel strikes on locked knees are a bad way to run, period.