Road-running shoes are designed for pavement and occasional forays onto packed surfaces with slight irregularities. Light and flexible, they're made to cushion or stabilize feet during repetitive strides on hard, even surfaces. Trail-running shoes are designed for off-road routes with rocks, mud, roots or other obstacles. They are enhanced with aggressive tread for solid traction and fortified to offer stability, support and underfoot protection. Cross-training shoes are designed for gym or Crossfit workouts or any balance activity where having more contact with the ground is preferred over a thick platform sole.
Health Overview: ABC News
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