Grip a dumbbell in each hand and set up like a normal squat, feet shoulder-width apart. Lower into a quarter or half squat, then explode upward hard enough that your feet leave the ground, extending through your hips, knees, and ankles as you jump. Land softly, letting your knees and hips bend to absorb the impact rather than landing stiff-legged, and flow straight into the next descent. The dumbbells add resistance without changing the movement pattern, so keep your chest up and your landing controlled — a sloppy landing under extra weight is where this one bites you. Reset your stance fully if you drift off balance on landing.