Cushioned running shoes, even wearing heel inserts, results in a larger heel-to-toe offset which was found to encourage force-intensive mechanics straining to the Achilles tendon as compared with minimalist running shoes or running barefoot.
Heel strike running is bad for the leg, not just by burdening the leg with more impact loads, but by causing the stance leg to be more unbalanced and ‘wobbly’, which increases the risk for a hyperextension injury to the leg.
One reason heel strike running is bad for the Achilles is that at heel strike, greater compressive impact is loaded through the tendon which was found to initiate degreeatniove changes to the tendon as compared with forefoot running.
Cushioned running shoes do not prevent injury because multiple studies during the past few decades have found that cushioned running shoes amplify impact by causing the foot to land harder on the ground while not only encouraging bad mechanics, but these shoes make bad mechanics even worse.
The reason why heel striking is so bad for running is because it’s the only foot strike pattern that produces the impact forces that directly cause long bone fractures.
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