The invention relates to method for evaluating the quality of characteristics of motion of an animal-human-dyad comprising an animal and a human and using at least one rein for riding the animal, wherein the quality of characteristics of motion is the loss of regularity of rhythm in the motion of the animal, the method comprising obtaining rein tension data indicating the tension in the rein (10) by means of a rein tension measuring device (20), wherein the the following steps are executed by a processing unit (90): processing the rein tension data into a frequency spectrum； identifying a prominent frequency component in the frequency spectrum； analysing the frequency spectrum by determining a power spectral density of the frequency spectrum over a frequency range which contains the prominent frequency component； and evaluating the loss of regularity of rhythm in the motion by comparing the determined power spectral density with a reference value. Further, the invention relates to an apparatus for evaluating the quality of characteristics of motion of an animal-human-dyad, wherein the apparatus comprises a rein tension measuring device, a transmitter unit, a receiving unit, a processing unit and a notification unit.
