Bodybuilders like to train their muscles by performing rigorous exercises. But these exercises could not have been possible without structural formation of joints. The kind of joint that helps in exercising biceps and triceps is:
Hinge joint
A hinge joint is a common class of structural joint that includes the ankle, elbow, and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend.