The Effect of Blended Learning New Technologies and Direct Video Feedback on the Long Jump Technique in Primary School Students. - Georgios Kyriakidis; Dimitris Chatzopoulos; Ilias Paraschos; Vassilios Panoutsakopoulos; Iraklis A. Kollias; Georgios I. Papaiakovou (Int. J. Hum. Comput. Interact., 2022)