this is a hand - propelled wheeled device for a rider . the device includes : a frame with two sides ; a first and second drive wheel rotatably mounted to the two sides ; a first hand crank connected to the first drive wheel through a first crank hub , and a first wheel hub that is connected to and rotates the first drive wheel ; a second hand crank connected to the second drive wheel through a second crank hub , and a second ratcheting hub that is connected to and rotates the second drive wheel ; at least one shifting mechanism to change a leveraging ratio between the first hand crank and the first drive wheel and between the second hand crank and the second drive wheel ; a pivoting backrest connected to the frame , wherein the pivoting backrest provides continuous back support to the rider ; an adjustable hammock seat connected to the frame ; a third support connected to the frame ; and a braking mechanism to retard movement of the first and second drive wheels .