just because the barbell two arm curl flexes both elbow joints at the same time does not make it a compound movement. thats like saying leg extensions are compound. With the hammer curl, the only difference is the way you hold the weight. If you have looked at people who move their shoulder with the two armed barbell curl, its because they cant curl.
There is really no one sentence that makes a definition of a compound or isolation movement. Both the "single joing movement" and "single muscle" movement are false, just you have to use common sence. However, i like the single joint definition the most. Since we all know alot of curls do alot for the forearms aswell. But then again, if its single joint, then stiff legged deadlifts are isolation, which they are not. Going by one of these definitions is not good IMO, because it causes you to put effective movements into the isolation group, where they shouldnt be. And it can cause you to put isolation exercises into the good compound group, where they shouldnt be.
Can you say, isolation is something you use to TARGET a specific muscle group? Since even though the biceps curl uses alot of muscles, its usually used to target the biceps. You cant really say that with a compound movement. Since with the compound movements more than one muscle is a primary mover..
There is really no one sentence that makes a definition of a compound or isolation movement. Both the "single joing movement" and "single muscle" movement are false, just you have to use common sence. However, i like the single joint definition the most. Since we all know alot of curls do alot for the forearms aswell. But then again, if its single joint, then stiff legged deadlifts are isolation, which they are not. Going by one of these definitions is not good IMO, because it causes you to put effective movements into the isolation group, where they shouldnt be. And it can cause you to put isolation exercises into the good compound group, where they shouldnt be.
Can you say, isolation is something you use to TARGET a specific muscle group? Since even though the biceps curl uses alot of muscles, its usually used to target the biceps. You cant really say that with a compound movement. Since with the compound movements more than one muscle is a primary mover..