How the Sumo Deadlift Differs
The sumo deadlift is a deadlift with a wide stance and your hands inside your knees. Your feet turn out, your hips sit close to the bar, and your torso stays more upright than in a conventional pull.
That position shares the work differently. The quads and hips do more, the lower back does a little less, and the bar travels a shorter distance. Some lifters are built for it and pull their best lifts this way. Others are stronger conventional. Both are honest deadlifts.
Stand wide enough that your shins are close to vertical when you grip the bar, turn your toes out, and push your knees out over them. Pull the slack out of the bar, then think of pushing the floor apart as you stand up.
Log your sumo pulls and this page charts your rep PRs and tonnage, ready to read beside your deadlift, so you can see which stance is moving.