Abstract: The invention concerns a device for automatically selecting and hooking weights of a physical exercising apparatus, the apparatus providing a single frame, a plurality of individual weights to be selected and engaged and a dragging element for the selected and hooked or engaged weight. The device provides at least one element for selecting and hooking the chosen weight and optionally weights upward of the chosen one. An activation system is provided to actuate at least one element for selecting and hooking the chosen weight. An electronic circuit for controlling the activation system and a system to set and control the selection and the hooking of the selected weight.