A pedal arrangement for a vehicle, comprising: - a first power transmission shaft, which defines a fictitious first rotating axis and which is adapted to rotate at least in a first direction of rotation about the first rotating axis; - a generator, adapted to convert mechanical energy of rotary movement into electric energy; - a mechanical power transmission apparatus, adapted to convert rotary movement of the first power transmission shaft into rotary movement of the generator; - a first pedal crank, which has a first end coupled to the first power transmission shaft and a second end, to which a first pedal for a user's foot is rotatably connected so that the first pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotating axis; and - a second pedal crank, which has a first end coupled to the first power transmission shaft and a second end, to which a second pedal for the user's other foot is rotatably connected so that the second pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotation axis; characterised in that the pedal arrangement further comprises: - a third pedal crank, which has a first end connected to the first power transmission shaft, and a second end, to which a third pedal for a second user's foot is rotatably connected so that the third pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotation axis; and - a fourth pedal crank, which has a first end coupled to the first power transmission shaft, and a second end, to which a fourth pedal for the second user's other foot is rotatably connected so that the fourth pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotating axis. - a first power transmission shaft, which defines a fictitious first rotating axis and which is adapted to rotate at least in a first direction of rotation about the first rotating axis; - a generator, adapted to convert mechanical energy of rotary movement into electric energy; - a mechanical power transmission apparatus, adapted to convert rotary movement of the first power transmission shaft into rotary movement of the generator; - a first pedal crank, which has a first end coupled to the first power transmission shaft and a second end, to which a first pedal for a user's foot is rotatably connected so that the first pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotating axis; and - a second pedal crank, which has a first end coupled to the first power transmission shaft and a second end, to which a second pedal for the user's other foot is rotatably connected so that the second pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotation axis; - a third pedal crank, which has a first end connected to the first power transmission shaft, and a second end, to which a third pedal for a second user's foot is rotatably connected so that the third pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotation axis; and - a fourth pedal crank, which has a first end coupled to the first power transmission shaft, and a second end, to which a fourth pedal for the second user's other foot is rotatably connected so that the fourth pedal crank is adapted to perform reciprocating rotary movement in relation to the first rotating axis.