This study aims to explain and study the phenomenon of bilateral disability of the upper end during weight training from the standpoint of biomechanics through:
- Biomechanical analysis of the phenomenon of the second deficit.
 
 
1- Research Methodology
The researcher used the descriptive method using the survey method to suit the nature of the study.
2- Research Simple:
The main study sample was chosen by deliberate method from the players participating in Maximum Gym Club in Port Said. The sample included (4) players.