Skinny man doing seated one arm curl with a small dumbbell. - 4K stock video

An underweight man wearing a loose white drop arm tank top sitting on a bench, was doing dumbbell concentration curls on his right arm in a gym.Concentration curls, also known as dumbbell concentration curls, are a variation on traditional biceps curls. Perform concentration curls by sitting on a bench, resting the back of your upper arm against your inner thigh, and lifting a dumbbell.