Believe it or not, there's been a lot of research regarding flip-flops. A recent study found that flip-flop wearers tend to grip the footwear with their toes, causing shorter stride length and improper force when their feet hit the ground.
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Flip-flops present feet with a painful problem
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Are Flip-Flops Bad for Your Feet?
Achy Legs? Throw out those flip-flops, high-heels, and flats