Deadlifts... love'em or hate'em you can't deny that they are the purest single test of strength because it is one of the few lifts where you lift a dead weight off the ground.
The deadlift is the oldest of all weight training exercises and it's very effective for building overall body mass and strength. It's a compound movement that works all of the major muscles in the body, with most of emphasis on the traps, spinal erectors, hips, glutes, and hamstrings.

There are 2 main deadlift variations that you'll see lifters perform:

Sumo Deadlifts and Conventional Deadlifts