wearing two Insoles for greater energy return.

Interesting

You have a link?

Yes, but only if your insoles are made with Boost material. Anything else will actually absorb energy.

Gary Oldman wrote:

Yes, but only if your insoles are made with Boost material. Anything else will actually absorb energy.

Correct. There's action and reaction. Traditional cushioning dissipates impact and energy. That's why racing shoes are less cushioned,a s a rule, than trainers are.

A vibrating material like a trampoline also has to be "tuned" correctly for it to help. Let's say your foot is on the ground for 0.16 seconds, that means it must have a natural frequency of 6-8 Hz so that when you push down on it as you land, it is pushing back up against you as you push off. If its natural frequency is say 20 Hz, then it will still be on its way "down" as you're trying to push off, which will hurt you, not help. Some indoor tracks propped up on boards can be "tuned" so that they help runners, which is one reason some of them are so fast.

HRE wrote:

Gary Oldman wrote:

Yes, but only if your insoles are made with Boost material. Anything else will actually absorb energy.

Correct. There's action and reaction. Traditional cushioning dissipates impact and energy. That's why racing shoes are less cushioned,a s a rule, than trainers are.

And so that they're lighter

Atlas wrote:

I recently came across this from experience and it makes sense from a physiological standpoint but I'm seeking the thoughts of the letsrun world on this. Wouldn't the extra cushioning(while retaining the lightweight feel of racing flats) add a spring like effect to your shoes?

Like a trampoline, there would be compression on foot strike and release of elastic tension on pushoff adding an extra dimension to power output and thus a performance and physiological benefit. It creates a energy return in the same way as an extended Achilles tendon does through compression and release and it offers greater reduction on impact stress at the same time

Have you not been paying attention to what elites are wearing? Many of them have been wearing old Adidas Adios (pre-Boost) and old Nike Zoom Streaks, probably cause making shoes too soft actually makes you slower. The "springs" of your feet/lower legs do a better job in terms of energy return and absorbing/dissipating impact force than a shoe.

I take the insoles out of my shoes for greater energy return, because my feet and leg tendons are a lot more elastic than flimsy insoles.

Are you saying that there are people who don't wear two insoles? If you only wear one, which shoe do you wear it in?

I wear two bras for greater support.

Why stop at two? Load 'em up.

I always have wrote:

Are you saying that there are people who don't wear two insoles? If you only wear one, which shoe do you wear it in?

Well played.