A Staggered Stance RDL is a single leg exercise that strengthens the hamstrings. It is a great exercise to help you improve your single leg balance.
From a standing position, with your feet shoulder width apart, slide your left foot behind you keeping your toes on the floor; this provides support for the right side during the movement. Hold a weight in each hand. When in position, start to hinge from the hips and move down towards the front leg whilst keep your chest up and shoulders back. Keep a small bend in the knee so it isn't locked, but you shouldn't bend your knee so you can reach further! Lower until you feel a slight stretch in your hamstring and then push back up. Repeat the movement on the same side for the instructed number of reps.
It is not uncommon to have one side that is weaker than the other so we would advise to start on your weaker side.