The invention relates to techniques and apparatus for measuring activity on a flexible mat of a trampoline. A potential drawback with prior art techniques is the inaccuracy of determining a user location on the jumping mat. Where a user location is being used as input to a processor, it is necessary to have as accurate a location reading as possible. A method of determining a bounce location of a person or an object on a flexible mat of a trampoline comprises a sensor arrangement determining a mat deformation signal, the sensor arrangement comprising at least two pairs of sensors arranged around the periphery of the mat, the pairs of sensors defining respective axes that extend between the sensors and wherein the axes of two of the at least two pairs of sensors are orthogonal to one another in a Cartesian coordinate space and are substantially parallel to a weave of the mat, the sensors being configured to measure a value corresponding to a deformation of the mat as the person or object moves on the mat, wherein, when the person or object is on the mat, the value measured by one of the pairs of sensors corresponds to a proximity of the person or object to one of the sensors; the sensor arrangement determining a bounce coordinate in the coordinate space based at least partly on the mat deformation signal; and the sensor arrangement determining a bounce location of the person or object on the flexible mat based at least partly on the bounce coordinate in the coordinate space.
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