The RDL or Romanian Deadlift
The hip hinge movement pattern can be trained many ways, including my favorite posterior chain movement, the Romanian deadlift or RDL. Every training program should include it.
So what's the difference between the traditional deadlift and the RDL? Two words: eccentric loading. The reason the RDL is so effective for building mass through the hamstrings, glutes, and back is that it incorporates both the eccentric (lowering) and concentric (lifting) portions of the movement. It also "stretches" the hamstrings, which elicits an anabolic effect when loaded properly. – Dr. John Rusin