Apparatus for assisting the movement of a subject during a training session comprising: - a frame having an elongated base and an upright support member positioned at the front of the apparatus; - a support unit comprising a bottom support, a back support, an upper body securing device and a switching mechanism configured to selectively switch the position of said bottom and back supports between at least two states, namely a seated state wherein the bottom support is substantially perpendicular to the back support, and a standing state wherein the bottom support is substantially parallel, preferably aligned, with the back support, and vice versa; - a movement assistance unit comprising, for each subject's leg, a foot fastener, a leg securing device, and a movement mechanism consisting of an assembly of elongated bars hingedly connected to each other, including at least one vertical bar that is pivotally coupled to the upright support member and extends downward therefrom in a substantially vertical manner, and at least one horizontal bar that is pivotally coupled to an opposite end of the apparatus and extends along the elongated base in a substantially horizontal manner, such that an elliptical leg movement path can be realised with said assembly (321,322); wherein the foot fastener and leg securing device are arranged on said horizontal bar; and, - wherein the leg securing device comprises a shackle and a height-adjusting mechanism configured to adjust the height of said shackle to a position adjacent to, preferably below, the subject's knee joint; such that the shackle secures the subject's leg at the pivot point of the knee when the switching mechanism switches between the seated and standing states; and, wherein the movement assistance unit comprises a pulling mechanism that is connected to each shackle and is configured to pull one shackle back when the other shackle moves forward, thereby providing an alternating leg movement; characterised in that the support unit is mounted on a rotatable base configured to rotate the support unit around the apparatus' vertical axis such that at least the bottom support and the back support can be oriented sideways for subject entry. - a frame having an elongated base and an upright support member positioned at the front of the apparatus; - a support unit comprising a bottom support, a back support, an upper body securing device and a switching mechanism configured to selectively switch the position of said bottom and back supports between at least two states, namely a seated state wherein the bottom support is substantially perpendicular to the back support, and a standing state wherein the bottom support is substantially parallel, preferably aligned, with the back support, and vice versa; - a movement assistance unit comprising, for each subject's leg, a foot fastener, a leg securing device, and a movement mechanism consisting of an assembly of elongated bars hingedly connected to each other, including at least one vertical bar that is pivotally coupled to the upright support member and extends downward therefrom in a substantially vertical manner, and at least one horizontal bar that is pivotally coupled to an opposite end of the apparatus and extends along the elongated base in a substantially horizontal manner, such that an elliptical leg movement path can be realised with said assembly (321,322); wherein the foot fastener and leg securing device are arranged on said horizontal bar; and, - wherein the leg securing device comprises a shackle and a height-adjusting mechanism configured to adjust the height of said shackle to a position adjacent to, preferably below, the subject's knee joint; such that the shackle secures the subject's leg at the pivot point of the knee when the switching mechanism switches between the seated and standing states; and, wherein the movement assistance unit comprises a pulling mechanism that is connected to each shackle and is configured to pull one shackle back when the other shackle moves forward, thereby providing an alternating leg movement; characterised in that the support unit is mounted on a rotatable base configured to rotate the support unit around the apparatus' vertical axis such that at least the bottom support and the back support can be oriented sideways for subject entry.