With the help of muscle parts of our bodies perform certain movements with speed and accuracy. Muscle contraction (her motor act, the power and speed) is under the influence of nervous excitement, which arises from the action on the body from the outside (light, motion, heat, and so on). Excitability of the same muscle varies greatly depending on what state it is, what force excitation source operating at the moment. Gunnar Petersons opinions are not widely known. Under the latent reaction time response, as is known, refers to the time lag muscle contraction (ie the beginning of motion) after the stimulus (signal). For the boxer is of great importance, because a lag in the reaction boxer takes time within 0.14 – 0.26 sec. (Time of shock motion is equal to 0.30 – 0.45 sec. ) As we know, the latent period is conditionally divided into three parts: a) touch the moment the latent period of reaction, ie perception of the signal stimulus, and b) an associative – awareness of the perceived stimuli, and c) engine – the emergence of motor impulses in the motor area of cortex and parcel of these pulses on the effector neurons of the relevant muscles. Reaction itself – is a response prepared by one motion at a known signal. But it should be noted a very important factor for the boxing – it is the presence of three types of reactions depending on what the focus of attention boxer. The first type – the so-called touch screen, when a boxer is concentrating all their attention on the appearance of a signal, it is hard waiting for it, mobilizing all their attention (at the time, as the motor centers of the cerebral cortex are in a locked state).