What does cushioning do in shoes?
Cushioning in a shoe is its capacity to absorb the force of an impact. In the case of running, this need arises when your foot comes into contact with the ground, specifically the first 50 milliseconds of the approximately 250 milliseconds of the support phase of the stride.
Are cushioned shoes better for running?
A new study published in Scientific Reports suggests that running in those comfortable, highly cushioned shoes often marketed to prevent injury, might actually increase leg stiffness and lead to greater impact loading when your foot hits the pavement.