Hi, I want to do concentration curls with dumbbells, to really isolate my biceps. Can you explain how the exercise is performed?
Hi, I want to do concentration curls with dumbbells, to really isolate my biceps. Can you explain how the exercise is performed?
user
OK, but I should warn you that this is for serious athletes.  You could probably do some dumbbell curls on your own without any injury.  Is that OK?
assistant
That's okay. How do I do a dumbbell concentration curl?
user
Here's an illustration.  First position your dumbbell so that it is hanging in front of your body.  It should be held with your thumb resting on the dumbbell, pointing toward your body.  Your forearm should be resting in front of the dumbbell.  That's called the bottom position.  In the first set of reps, I want you to curl the dumbbell up so that your forearm is pointing straight up.  Be sure that your thumb is not twisting at the bottom of the movement.  As the dumbbell is getting higher, take in a breath, and as it's getting lower, let out a breath.  The rep ends when the dumbbell has stopped.  The full movement should take about half a second.
assistant
Okay, am I standing while I'm doing this? Or sitting down?
user