An exercising device includes a front frame, a resistance flywheel mounted rotatably on the front frame, a drive wheel connected drivingly to the resistance flywheel, a crank wheel, a shaft connected rotatably to the front frame and extending centrally through the drive wheel and eccentrically through the crank wheel for co-rotating the drive wheel and the crank wheel, two pedal units connected respectively to left and right ends of the shaft, a handle assembly mounted on top of the front frame, a rear frame extending rearwardly from the front frame, a slide seat mounted slidably on the rear frame, a chair supported on the slide seat, and a link mechanism connected to and disposed between the slide seat and the crank wheel. The link mechanism is driven by the crank wheels as to move forward and rearward the slide seat.