Improvement of special training of weight-lifters by means of various groove machines in the preparatory period at the stage of preliminary basic preparation Journal title: Slobozans`kij Naukovo-Sportivnij Visnik [Slobozhanskyi Herald of Science and Sport] Authors: Piven A. | Харківська державна академія фізичної культури, Харків, Україна Subject(s): Education, Sports and Recreation, Rehabilitation, Health and Wellness