The invention discloses a fitness center which comprises handrails, a frame, a driving device, holding devices, a first lifting mechanism, a running belt, a front roller, a rear roller, a running platform, a motor, a motor control panel, a brake resistor and a gradient sensor. The front roller and the rear roller are connected to the two ends of the running belt, and the gradient sensor is arranged on the running platform. The gradient sensor can automatically record gradient data during gradient lifting of the running platform, and the motor control panel adjusts the resistance value of the brake resistor, so that the running belt can keep constant speed at high and low gradients; the two sides of the frame are each fixedly provided with a holding device, each holding device is rotationally provided with a handrail, and after the driving device drives the handrails to rotate relative to the frame, the handrails are held and fixed through the holding devices; and the front portion of the running platform is connected with the first lifting mechanism, the first lifting mechanism drives the front portion of the running platform to ascend and descend. According to the scheme, a body building user can grasp the rotating and tightly-held handrails to do a similar rock climbing motion mode under the condition of large-gradient running.