Romanian Deadlifts are a staple in many workouts and with good reason - can be done with a decent amount of weight and they work so many muscles!
Whether the emphasis is on losing body fat, building muscle, wanting a better butt or an accessory lift to help with the deadlift, there are many reasons to use this exercise.
However, in some situations the weight you can use can be a limiting factor - peak time and the weights you want are all in use or the gym you're in doesn't have heavy enough weights. It could even be that you found you're compensating more on one side as it is stronger. Maybe you just want to switch things up and challenge yourself with something different
In any cases like that, trying the 1 leg Romanian Deadlift is a great way to challenge yourself.
For a start, it is common to feel off-balance and wobbly.
Some of this is to do with the ankle and calf muscles having to work in some new ways to help keep you stable. Then it is just a skill to learn the movement pattern.
Once you can master the bodyweight version, it's easy to add weight to this exercise.
This is my, mostly, Personal Trainer musings and information which I hope you'll find helpful!