The present invention discloses a method for intelligent recognition of microorganisms comprising the following steps: a. The method of the present invention comprises generating a recommendation model based on aggregate activity generated though use of a network resource. The phase of electric signals transmitted through the first and third wiring lines differs from the phase of electric signals transmitted through the second and fourth wiring lines by 180\xb0. The training device serves the dual purpose of providing a means of balancing the skater as well as slowing and braking the forward movement of the skater to control and limit the speed of the skater.