Which of the following is an example of proper movement for a biceps curl?
rotate the arm at the shoulder with the back straight
bend the arm at the elbow with the back straight
rotate the elbow and arch the back
bend the elbow and move the upper arm forward

The best example for proper movement for a biceps curl is the option B. Bend the arm at the elbow with the back straight. When you do that movement you are doing it properly. The rest of the movements described here, if you see carefully, may hurt the elbow. Hope this helps

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.