Often incorrectly called a Romanian Deadlift or considered the same thing as a straight-legged deadlift. The RDL and SLDL are similar – the key difference is that in the Stiff-Leg Deadlift, the knees fully extend at the top of the movement. From a starting position of fully extended knees and hips, push the hips back and bend the knees slightly as you lower the bar, keeping the back set in complete extension. The depth the bar is lowered is dependent primarily on hamstring flexibility. Return to the top, fully extending the knees and hips.