Start with a dumbbell in each hand at your sides, hinge slightly at your hips, then pull them up close to your body in one quick motion, snapping your elbows underneath the weights to catch them resting on your shoulders -- that's the clean. From that racked position, drive the dumbbells overhead until your arms lock out above your ears, then lower them back to your shoulders under control before dropping into the next clean. The clean is a fast, athletic pull, not a slow curl; let your hips and a slight knee bend snap the weights up rather than muscling them with your arms alone. Reset your stance between reps if you need to.