Performing the: A Step-by-Step Tutorial Dumbbell One Arm Concetration Curl
Bend your elbow and rest it against the same side inner thigh, allowing the dumbbell to hang down towards the floor.
Slowly curl the dumbbell up towards your chest, keeping your upper arm and elbow stationary on your leg to isolate the bicep.
Hold the position at the top of the curl for a moment, squeezing your bicep muscle.
Slowly lower the dumbbell back down to the starting position, repeating the exercise for your desired number of reps before switching to the other arm.