Exercise orthoses are described that include a frame, a fluid bladder held by the frame, a pressure sensor attached to the fluid bladder and a microprocessor receiving the pressure measurements. The arrest with the corresponding thrust member, adjustable in a direction parallel to the direction of displacement of the arrest, is carried by a slide that is adjustable in a direction orthogonal to the direction of displacement of the arrest. Furthermore, testing a mobile application can include testing performance of the mobile application for each of the simulated cellular network conditions.