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A 2001 survey conducted by researchers from Pennsylvania State University using 200 women found that 58% of women complained of lower back pain when wearing heels and 55% of women said they felt the worst overall back pain when wearing the highest heel. The researchers explained that as heel height increases, the body is forced to take on an unnatural posture to maintain its center of gravity. This changed position places more pressure and tension on the lower lumbar spine which explains why the women complained of severe back pain at a higher heel length.
The Turbo 2 is built for women who want to go fast, with a soft, springy ZoomX foam in the midsole borrowed from the record-setting Vaporfly Flyknit 4%. Typically, an EVA foam midsole will compress easily and then take its sweet time recovering shape. But ZoomX technology has blown us away with its quick compressibility and immediate rebound. Nike has added a thin layer of React foam to the bottom so the shoe will hold up for longer, as well as a rubber outsole grid for traction. Overall, this is a high-mileage, versatile shoe that combines the fit and feel of a workhorse Pegasus with the lightweight speed of a racing flat. Just be warned that upper feels slightly less secure than the first Peg Turbo.