A method, computer program product, and computer system for defining, at a computing device, one or more channels for executing one or more test scenarios. The composite materials have improved thermal insulation ability. This enhancement of the communication satisfaction is possible because the integrated communication preferences provided to a presence watcher reflects not only the presentity’s communication preferences but also the presence watcher’s communication preferences. The plunger-sealing ring and the cylinder-sealing ring are metallic, their mutual contact surfaces are fitted to each other, and the plunger-sealing ring has sufficient section modulus to ensure that under high pressure the contact and bending deformations at the mutual contact surfaces will be sufficiently small as to keep a tight fit therebetween. Feedback signals indicate to a user the correct position of the feet and correct performance of a training and rebalancing routine.