To identify the effectiveness of plyometric exercises to improve muscular strength and achievement in shot put event by students (20-22 years old). The researchers used an experimental method; the sample was formed by students belonging to the institute of physical education & sports, University of Mostaganem (Algeria). Thus it was the application of the experimental method was applied on a sample of third-year students (males) of 45 students divided into two groups, first control group of 22 students and an experimental group of 23 students. While the tests used were (strength test, achievement test). After the treatment of the results by statistical means, and through these results it have been reached several conclusions of them, plyometric Exercises to develop muscular strength and achievement in shot put [discussion significant difference (*p?0.05)]. And best improve of the experimental sample based on plyometric exercises compared to the control sample, which rely more on the technical side only in shot put event.

Summary The researchers seek to identify the impact of weighted balls on performance speed in wheelchair basketball players. An experimental method has been used in conformity with research nature between pre-tests and post-tests sample. The sample was selected by the intended manner and divided into two equal groups (10 players experimental sample, 10 players control sample) for the 2019/2020 sports season. A speed test (5 m and 20 m without ball), speed test (5 m and 20 m with ball) were used. After statistical treatment of the results, the researchers concluded: The weighted balls are important to develop performance speed in wheelchair basketball players, and the best improvement of the experimental group based on of weighted balls is marked comparing to the control group. A regular physical training with weighted balls is very important to improve of performance speed of persons with disabilities in basketball game.