The study aims to identify the effect of very short speed training on the digital level of swimming 100m front crawl. The sample was selected from the swimmers of Al-Nasr Club in Heliopolis, Cairo, consisting of (27) swimmers for the age group (14) years. The research sample was selected using the deliberate stratified method from swimmers born in 2009, and their number was (24) swimmers. (4) swimmers were excluded for not being regular in the training process and attending, and (4) swimmers were randomly drawn from the research sample as a survey sample; thus, the basic study sample became (16) swimmers. The results indicated that. - Very short speed regulation training had a statistically significant positive effect on the digital level of 100m crawl swimming for junior swimmers. - There were improvement ratios between the pre-measurement and post measurement in the digital level of 100m crawl swimming using very short speed regulation training for junior swimmers. Conclusion. The role of the coach in training swimmers on this type of USRPT is that he must play the role of a teacher of technique, and the second role is that of a training program designer and technical director and performs other activities such as timing the swimmers and calling on the swimmers to perform repetitions in the training set so that time is not wasted.