we’ll be looking at the main differences between stiff leg deadlifts and RDLs. We’ll look at muscles worked, technique, knee extension , range of motion, and strength development. Let’s get started! RDL The knees are bent more than in an SLDL, which allows for greater spine activation and knee extension . This exercise requires more range of motion. The Romanian deadlift is great for strengthening and hypertrophy of muscles which are paraspinal like the erector spinae & multifidus. SLDL The knee