1. An exercise system, comprising: an exercise machine comprising: a user operation part configured to be operated by a user for exercise; a stepless force device configured to apply resistance on the user operation part; a sensor configured to sense a location, a speed or an acceleration of the user operation part; a storage unit configured to store a software application program, an exercise program, a personal training parameter and a training result, and wherein the exercise program comprises a preset resistance setting function and an adjustable parameter which has a corresponding relationship with the location, the speed or the acceleration of the user operation part; an operation interface configured to provide the user to set the personal training parameter on the exercise machine; and a control unit configured to execute the exercise program to control the stepless force device to output resistance according to the personal training parameter, and dynamically adjust the resistance during exercise of the user according to the location, the speed or the acceleration and the adjustable parameter, and record the training result, and execute the software application program to display exercise information on the operation interface; and a data transmission device configured to communicate with a remote device, and wherein the control unit selectively downloads the personal training parameter from the remote device or uploads the training result and the personal training parameter to the remote device, through the data transmission device.