The invention proposes a fitness and therapy mat for standing and walking made of foamed material for sport, gymnastic, and therapeutic purposes. A guide device is provided for at least one continuous drive train which having a driving side and a slack side, and having a first return element and at least one second return element around which the at least one continuous drive train circulates. The sensor generates signals indicative of the sensed infrared radiation in each of the wavelength ranges. The method may further include modulating the optical carrier signal to generate a modulated optical signal based on quadrature amplitude modulation input signals. Such a vehicle is capable of detecting and displacing material in a very reliable manner by utilization of the depth image obtained by the sensor.