We perform these mostly with the TRX but you can also do them with weights or kettlebells.  This is one of my favorite exercises to add to our workout and I love talking about the benefits of it during class!

Cueing the Single Leg Deadlift:

Holding the TRX straps facing the barre with back straight, chest out, and shoulders pulled down and back. Arms should be extended down slightly in front of you with some tension on the straps; balance on one leg keeping the other leg straight and just slightly behind you.Keep the raised leg and torso in alignment, inhale driving the hips back slightly as you let the torso fall forward and the raised leg sweep back behind you. Keep the hips squared towards the floor and the back straight.Exhale contracting through the hamstrings and glutes bringing the torso back up right letting the raised leg slowly lower towards the floor.

Common mistakes:

Opening up the hips; Bending the back down towards the floor

Benefits:

-It’s a FULL Body exercise, working simultaneously your glutes and hamstrings, strengthens your core from your shoulders to your hips and your back, even strengthening your calves and ankles.  

-Not only develops hip strength and power, but it also allows the muscles of the hips and legs to act as stabilizers. Every time you stand on one leg, you’re using the same muscles for balance and stability that are generally used for force production.

-Improve balance and coordination and Correct imbalances between sides of the body

-Functional movement through the hips. The Single leg deadlift is one of the best ways to functionally target the hamstrings. throughout normal everyday movements, it is actually hip extension, and not knee flexion, that plays a dominant role in movement and developing power in a host of activities, like walking, running, and biking.

-Increases Mobility and flexibility: involves hinging forward from the hips until your upper body is parallel to the floor. As you lean forward, your non-weight bearing leg is extended behind you. These large ranges of movement require and develop good hip mobility and hamstring and hip-flexor flexibility

http://www.theprehabguys.com/3-reasons-why-you-should-do-the-single-leg-romanian-deadlift/

https://www.google.com/search?q=single+leg+deadlift&oq=single+leg+&aqs=chrome.0.0j69i57j0l4.8787j0j8&sourceid=chrome&ie=UTF-8#q=single+leg+deadlift+benefits