Sports injuries are defined as a problem that occurred during sportive activities or after, which cause a decrease in the frequency and intensity of activity, requiring medical treatment, with social and psychological effects. 1,2 No matter what sports branch, it is possible that all athletes actively doing sports experi-ence serious or not important injuries. Different injuries can be seen on different body parts based on the implemented sports. Some factors causing sports injuries are such as spending time in competition and training, the player's technique, his/her training methods, the training facility conditions, and the use of

With the increasing importance of physical fitness in the world, physical activity types such as CrossFit, which includes high-intensity combined movements, have become popular. The aim of this study was to compare the rectus abdominis (RA) muscle activation during the kipping toes-to-bar (KTB) and the strict toes-to-bar (STB) movements. RA muscle activation was measured during the KTB and STB exercises in 12 healthy young men. Participants performed 5 repetitions of both KTB and STB exercises in randomized order. Participants performed both exercises with a 5-minute rest interval. For comparing the RA muscle activity during the KTB and STB paired sample t-test was used. A significant difference was found between the KTB (359.56 ± 160.50 μV) and the STB (415.37 ± 185.63 μV) for RA muscle activation (p<0.05). These findings demonstrated that the difference in RA muscle activity during the STB and KTB movements showcases the importance of the STB movement on the RA that revealed greater motor units’ activation in a non-oscillation position. The study finding emerges that the same exercise can lead to different motor unit activations in the same muscle group, depending on the way the movement is performed.