CURVED TREADMILL

Curved treadmill having a base comprising: a physical exercise surface (5) configured for rotating around a first roller (3) and a second roller (4), converting the potential energy of the user on the physical exercise surface 5 into rotational kinetic energy; a first pulley (21) operatively connected to the first roller (3) adapted to rotate around a respective rotation axis (AP). The base comprises a first coupling device (20) of the first pulley (21) with the first roller (3) operatively connected between the first roller (3) and the first pulley (21). The first coupling device (20), during the rotation of the physical exercise surface (5) in a first rotation sense (S1) along the longitudinal axis (L) of the base, is configured for allowing the integral rotation of the first pulley (21) and the first roller (3) around the respective rotation axis (AP, A1) if the rotation speed of the first roller (3) is equal to or greater than the rotation speed of the first pulley (21) and for preventing the integral rotation of the first pulley (21) and the first roller (3) around the respective rotation axis (AP, A1) if the rotation speed of the first roller (3) is lower than the rotation speed of the first pulley (21).