Fit athletic man doing dumbbell hammer curls at gym in slow motion

bicep curl bicep train exercise hammer curls dumbbell hammer curls arm hand workout 30th man male one sit lift dumbbell slow motion training exercise weights arms sportsman curl muscular sport gym athletic physical strength one person activity training muscle raise athlete biceps bicep curls biceps workout dumbbells weight training dumbbell curl exercising strength workout body motivation fit fitness concentration heavy 3039 years caucasian