Stand with your feet wider than shoulder-width apart and toes slightly turned out. Place a dumbbell (or two dumbbells between your legs depending on setup) close to the floor. Keep your chest up, core braced, and spine neutral. Bend your knees and hinge at the hips to lower your body, reaching down to grip the dumbbell(s) between your legs. Drive through your heels and midfoot to stand up, extending your knees and hips at the same time. Keep the weight close to your body as you rise. At the top, squeeze your glutes without leaning backward. Lower the weight back down under control and repeat for the desired reps.
Log your dumbbell sumo deadlift sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.