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Vibration training on the PowerBoard 2.1 by Casada with alternating motion, which is adapted to the human anatomy, stimulates the targeted muscles in an optimal and joint-friendly way. This triggers a stretch reflex in the muscles, which leads to a contraction from the legs up to the back. Depending on the training frequency, the number of reflexes per second varies. For example, at a frequency of 25 Hertz per second, up to 1500 cycles can be achieved in the muscles.