The aim of this pilot study was to examine the effectiveness of a CrossFit-based training program to enhance the general and sport-specific physical fitness of 10–12-year-old judokas. The study was conducted between September 2021 and February 2022. The pedagogical research experiment was designed to be one complete, annual macrocycle (September–June). The current study presents mid-point data. Twenty male participants (3 years average sports experience; age = 11 ± 0.64 years) were randomly assigned to one of two groups: CrossFit-based training (experimental, n = 10) and traditional training (control, n = 10). Baseline testing was conducted by the researcher and included tests for motor skills and general physical fitness domains including Sweden wall pull-ups and leg raises, push-ups, long jump, squats, burpees, shuttle run, and forward rolls. Judo-specific tests included O Soto Gari and O Goshi throws. CrossFit-based training was implemented twice per week for 15–20 min in the experimental group after usual training. The control group completed traditional methods of physical fitness training for judokas with the same training load regarding time. Experimental group participants significantly improved on leg raises (p < 0.01), push-ups (p < 0.05), and shuttle run (p < 0.001); the control group improved their shuttle run (p < 0.001). Only the experimental group improved on the O Soto Gari (p < 0.01) and O Goshi throws (p < 0.05). Results showed that the use of CrossFit-based trainings had a positive effect on 10–12-year-old judokas’ speed-strength abilities, speed-strength endurance, and muscular strength.

The development of reliable and safe e-voting systems is relevant because of the wide range of applications. This paper provides an analysis of modern electronic voting systems based on security criteria. An analysis was conducted based on the most popular modern e-voting system architectures. The analysis provides a baseline for developing a secure e-voting system.

CrossFit trainings tend to have a noticeably positive impact on the physical and functional preparedness of athletes, as well as on the harmonious development of motor abilities which are endurance, strength, flexibility, agility and coordination. Considered one of the best training systems for improving general physical preparation, CrossFit exercises carry noticeable benefits in the harmonious development of athletes' physical and functional preparedness comprising several motor skills. Along with the obvious advantages, CrossFit also has its drawbacks necessary to take into account when drawing up training plans.

For testing speed-strength ability of young judokas were used maximum (max.) push-ups in 10 seconds and long jump exercises. In the case of the first exercise, the amount of repetitions were measured, and in the case of the second one – the length (cm). Before experiment in the experimental group for max. push-ups in 10 seconds the average was 15.8 and in control group - 20.5 (p > 0.05). During the intermediate testing, judokas in experimental group showed result in average 20, while judokas in control group showed result 18 (p > 0,05). As can be seen from the results obtained, the athletes in the experimental group improved their performance in push-ups exercise, while athletes in the control group showed worse results.

The article presents the stories of the creation of crossfit and circuit training method, their essence, the means used, the effectiveness in the process of physical training of athletes. An attempt was made to present the distinguishing features of these two directions. In the article there are also presented examples of using crossfit and circuit training methods for developing physical fitness of athletes. Key words: �rossfit, circuit training method, physical fitness, athlete, weightlifting, workout.