Assistance apparatus wearable by a subject for receiving assistance in forward reclining movements of the torso, comprising: - an upper structure for the engagement of the subject's torso and a lower structure for the engagement of the subject's legs, - said upper structure and lower structure being pivotally connected to each other around an axis (a), - at least one elastic device (7; 18) operatively interposed between said upper structure and said lower structure, - wherein said apparatus further comprises at least one electric motor operatively arranged in series with said at least one elastic device (7; 18), between said upper structure and said lower structure, and actionable for dynamically controlling the extent of deformation of said at least one elastic device (7; 18), - wherein said at least one elastic device (7; 18) is either: - an elastic joint comprising a first portion and a second portion rotatably coupled to each other and one or more springs operatively interposed between the first portion and the second portion, wherein said first portion is operatively associated to a shaft driven by said at least one electric motor and the second portion is operatively associated to said upper structure, the electric motor having a body operatively associated to said lower structure. or: - a spiral spring with an axis substantially coincident with said pivot axis (a) and having a first end operatively associated to said upper structure and a second end operatively associated to a shaft driven by said at least one electric motor, said shaft having an axis substantially coincident with said pivot axis (a), said electric motor having a body operatively associated to said lower structure, and wherein said at least one electric motor is supported with its axis (b) arranged parallel and distanced with respect to the pivot axis (a) between said upper structure and said lower structure and has its motor shaft connected to said driven shaft by means of a reducer belt transmission. - an upper structure for the engagement of the subject's torso and a lower structure for the engagement of the subject's legs, - said upper structure and lower structure being pivotally connected to each other around an axis (a), - at least one elastic device (7; 18) operatively interposed between said upper structure and said lower structure, - wherein said apparatus further comprises at least one electric motor operatively arranged in series with said at least one elastic device (7; 18), between said upper structure and said lower structure, and actionable for dynamically controlling the extent of deformation of said at least one elastic device (7; 18), - wherein said at least one elastic device (7; 18) is either: - an elastic joint comprising a first portion and a second portion rotatably coupled to each other and one or more springs operatively interposed between the first portion and the second portion, wherein said first portion is operatively associated to a shaft driven by said at least one electric motor and the second portion is operatively associated to said upper structure, the electric motor having a body operatively associated to said lower structure. or: - a spiral spring with an axis substantially coincident with said pivot axis (a) and having a first end operatively associated to said upper structure and a second end operatively associated to a shaft driven by said at least one electric motor, said shaft having an axis substantially coincident with said pivot axis (a), said electric motor having a body operatively associated to said lower structure, - an elastic joint comprising a first portion and a second portion rotatably coupled to each other and one or more springs operatively interposed between the first portion and the second portion, wherein said first portion is operatively associated to a shaft driven by said at least one electric motor and the second portion is operatively associated to said upper structure, the electric motor having a body operatively associated to said lower structure. or: - a spiral spring with an axis substantially coincident with said pivot axis (a) and having a first end operatively associated to said upper structure and a second end operatively associated to a shaft driven by said at least one electric motor, said shaft having an axis substantially coincident with said pivot axis (a), said electric motor having a body operatively associated to said lower structure, - a spiral spring with an axis substantially coincident with said pivot axis (a) and having a first end operatively associated to said upper structure and a second end operatively associated to a shaft driven by said at least one electric motor, said shaft having an axis substantially coincident with said pivot axis (a), said electric motor having a body operatively associated to said lower structure,