File:Carva .jpg Carva is a Lean Steer elliptical cross-trainer, human-powered, tricycle. Two wheels in the front and one in the back. Used to simulate outdoor walking or running without causing excessive pressure to the joints, hence decreasing the risk of impact injuries. Carva offers a non-impact cardiovascular workout that can vary from light to high intensity based on the riding preference chosen by the user. Primary source claim
 Carva is a Lean Steer elliptical cross-trainer, human-powered, tricycle. Two wheels in the front and one in the back. Used to simulate outdoor walking or running without causing excessive pressure to the joints, hence decreasing the risk of impact injuries. Carva offers a non-impact cardiovascular workout that can vary from light to high intensity based on the riding preference chosen by the user. 
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File:Carva .jpg
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Primary source claim