Grab a long bar and attach to a pulley at the top of a stack. With a overhand grip with thumbs facing each other, hold the bar nice and wide and take one step back from the stack.
Brace your back and tense your core and bring the weight in one clean movement down to your thighs. The arms can be straight or slightly bent, but must not change during the exercise. At the bottom squeeze your last and the slowly allow the weight to rise back to the starting position.