Erica Davis hangs above the treadmill. Though her feet are grounded on the belt, she has a feeling of suspension that's combated only by the parallel bars she can use to support her arms.
Her legs are at the mercy of the trainers who sit on either side, controlling each movement as they simulate the walking motion on the treadmill. To make sure the movements are properly mimicked, the trainer to Erica's left refers to a computer screen that tells him if the steps are being taken at the appropriate time.
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