This device, weighing just about 4.4 pounds and fully foldable, adjusts to your body to give you that extra boost when you need it most. Imagine a backpack that, instead of adding weight, takes off up ...

You’re halfway through a run when your legs start feeling like cement blocks. Your breathing becomes heavy and ragged, and that nagging side stitch just won’t subside. Your goal was to make it 20 more ...