[Scott Nietfeld] built a charger from a Dyna-flex wrist exerciser. We hadn’t heard of a these gyroscopic devices before but once we saw the promo video (embedded after the break) we realized that this ...

A 4,000-pound nautilus machine will work the big muscle groups, but if it’s your forearms and hands you want to strengthen, there’s a piece of equipment that’s considerably more portable. Weighing in ...