Credit: Anna Iovine / Mashable Stakt Weights are compact and don't take up too much space in my one-bedroom Brooklyn apartment, which is more than I can say for other clunky non-adjustable ...
Functionally, the biceps are key players in elbow flexion (bending the arm), forearm supination (rotating the forearm so the palm faces upward, like turning a doorknob or opening a jar), and shoulder ...