The Bionic Runner is a bicycle that replicates the motion of running without the hard landing that occurs at the bottom of every stride. The repeated impact of feet on ground often results in injury among runners.
The Bionic Runner is designed to allow users to deploy a mid-foot running gait that essentially engages the same muscles that are engaged during regular running on the ground, but with the added caveat that joints are protection and over-exertion is easier to avoid. The contraption also allows for lift at the 'toe-off' stage of each stride, while also allowing users to increase or decrease resistance via switch gears.
The Bionic Runner is currently the subject of a Kickstarter campaign. A pledge of $745 will get you a unit if the campaign is successful.