Watch the biceps brachii muscle in motion with our Dumbbell Concentration Curl animated video. See how the biceps brachii muscle expands and contracts during this exercise.
I am uploading the following video fully and freely (it is also included in the Muscle&Motion Strength Training app).
Please share this video to every trainer and trainee that you may know to better communicate how and which muscles are flexing during exercise.
Amit G. Alon