Weightlifting has increased popularity after the movements started being performed for other populations, such as CrossFit practitioners. This study investigates the influence of anthropometric parameters on low back forces during Snatch and Clean and Jerk weightlifting movements using Digital Human Modeling (DHM). Weightlifting techniques were simulated for three anthropometric models: slim, average, and strong, representing beginners, intermediate, and experienced practitioners, respectively. The simulations analyzed compression and shear forces on the lower back. Results indicate gender-specific differences in compression forces, with females generally experiencing lower magnitudes. Shear forces varied with anthropometric parameters, showing higher peaks for taller and heavier males. Notably, female models could lift heavier loads before reaching injury thresholds compared to males. The study underscores the importance of proper lifting technique over increasing weight, particularly for individuals with lower muscle mass. These findings contribute to understanding the biomechanical factors influencing injury risks in weightlifting.