An exercise and gait-training apparatus (1A, 1B) is provided primarily, but not exclusively, for use in the rehabilitation of disabled persons but is also suitable for use by sportspersons who wish to correct or alter their gait to improve their performance. The apparatus (1A, 1B) comprises a framework (2) adapted for location above a surface. A harness (15) is provided to support a person relative to the framework (2). An orthosis (23) is also provided for attachment to a lower leg or a foot of one leg of said person. A first pair of first actuators (14a, 14b) is connected to the framework (1) and adapted to move one side of the harness (15) and thereby a hip or a thigh of said one leg of said supported person relative to the framework (2). A second pair of first actuators (26a, 26b) is connected to the framework (2) and adapted to move the orthosis (23) relative to the framework (2). A control means (6) is provided to control and to synchronize operation of the actuators (14a, 14b, 26a, 26b) such that the first leg is moved in a pathway simulating a natural movement of the leg during one of a walking, a running or a sporting activity. Preferably, a second orthosis (23) is provided for attachment to a lower leg or foot of the other leg of said person and an arrangement of second actuators (14a, 14b, 26a, 26b) identical to the first actuators is provided to move the other side of the harness (15) and the second orthosis (23) relative to the framework (2). The control means (6) is then adapted to control operation of all the actuators (14a, 14b, 26a, 26b) such that both legs are moved in pathways simulating their natural movement during one of a walking, a running or a sporting activity. Both static and mobile embodiments of the apparatus (1A, 1B) are possible, in the latter case the framework (2) is provided with wheels (3, 4).