Nike put its energy-returning foam into a shoe you can train in
Nike Women's React Infinity Run FK Running Shoe, Lilac/Pistachio, 7.5 B(M) US - Walmart.com
FDDI - Energy return lies in the design of the shoe. As someone exerts energy, most of that energy is transferred through the shoe and into the ground, and can no longer
Ask the Gear Experts | Running Shoes with High Energy Return